Definition of chock in English:



  • 1A wedge or block placed against a wheel or rounded object, to prevent it from moving.

    • ‘He must keep an eye on the helicopter, monitoring the installing or removal of chocks and tiedown chains.’
    • ‘Remember, the approach isn't really over until the chocks are in.’
    • ‘With the deck-status light flashing green, I signaled the LSE to remove chocks and chains.’
    • ‘Basil had already started the engine, and when the airman removed the chocks, James throttled up and taxied out onto the runway, if it could still be called that.’
    • ‘Ken signaled for the ground crew to pull the chocks.’
    • ‘The chocks under the wheels of the Juggernaut of state control have been well and truly blown away this week.’
    • ‘One sees the wood chocks pulled away, the biplane taxiing on grass out into the middle distance.’
    • ‘The noise sounded like the familiar slamming of a crew door after the chocks are pulled, before shore-based taxiing.’
    • ‘We won't remove chocks from the front of the tire, we'll kick ‘em out from behind and pull them out from the side.’
    • ‘We looked for the leak, and I noticed the lineman did not put in the chocks after shutdown - the aircraft started inching aft.’
    • ‘He ran alongside the main landing gear and attempted to insert a chock under the main tire.’
    • ‘I had failed to turn off the ignition and to install chocks on the van.’
    • ‘The chocks were removed, and engines three and four were started.’
    • ‘See that master ignition switches and individual ignition switches are off, set parking brakes and have the ground crew remove the wheel chocks.’
    • ‘One of the mechanics pulled the chocks while another yanked the boarding ramp from the access door that the captain had jerked shut and secured.’
    • ‘Since there is no backup system to the parking brake, the only sure way to prevent a 100,000-pound aircraft from rolling out of control is to bring your own chocks, especially when you are going to a foreign field.’
    • ‘Investigation later revealed that the wrong type of chocks were used to chock a number of aircraft that could have started rolling at any given time due to the high winds on that date.’
    • ‘The controlling yellowshirt signaled the blueshirts to install chocks and tie-down chains.’
    • ‘Finally, some Chief came over, pulled the chocks and had my plane moved to the aft elevator.’
    • ‘I signaled the plane captain to remove chocks and landing gear pins, looked down to the checklist, looked up again, and saw a thumbs up.’
    tapered block, door stop
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    1. 1.1 A support on which a rounded structure, such as a cask or the hull of a boat, may be placed to keep it steady.
      • ‘You will have to work with and get permission from the yard for this, as there are all sorts of legal and liability issues here for setting extra chocks.’
      • ‘But although she was up on chocks, her waterline didn't come any higher than my shoulder.’
      • ‘Thinking on their feet, the technicians positioned a maintenance stand with a wooden chock under the housing to hold the pump in position.’
      framework, rack, holder, stand, base, support, mounting, mount, platform, prop, horse, rest, plinth, bottom, trivet, bracket, frame, subframe, structure, substructure, chassis
      View synonyms
  • 2A fitting with a gap at the top, through which a rope or line is run.

    • ‘There are chocks of assorted age and make, battered into shapeless bashies, as well as many fine #1 Friends, sunk and overcammed deep into fingercracks which refuse to give up their dead.’
    • ‘Where your lines go through chocks, they will need chafing gear.’
    • ‘These will absorb an awful lot of chafe, and if they do chafe though, veer just a little more line and a new piece of hose will be in the chock to take the chafe.’
    • ‘You heard that correct, no pitons, no chocks, no carabiners, no protection to secure the ropes in the event of a fall.’
    • ‘Trad climbers use friends, chocks, stoppers and other passive and active gear instead.’


  • 1Prevent the forward movement of (a wheel or vehicle) with a chock.

    • ‘For having to do some of the worst jobs on the flight deck - cleaning, chocking and chaining - they keep in really good spirits.’
    • ‘The driver chocked front wheel with an aluminum wedge roped to the cab and went around to the back of the truck.’
    • ‘Airman Niedermayer stood next to the Crew Chief, as the rest of the Air Force team chocked the aircraft.’
    • ‘While awaiting maintenance arrival, Airmen Green and Helton continued patrolling the area to verify that all aircraft were chocked.’
    • ‘Then, with the aircraft chocked, pinned, and tailwheel locked, we started over on the taxi checklist and eventually completed the mission.’
    • ‘This flight-deck director didn't understand the pilot's intentions, or he wouldn't have run out on the deck and started to chock and chain the aircraft.’
    • ‘Seeing smoke billowing from the vicinity of the nose radome and sensor turrets, he quickly directed the crew chiefs to chock the aircraft.’
    • ‘If the ramps were icy, one person had to keep watch to make sure the plane didn't creep ahead even though the main landing gear legs were chocked fore and aft.’
    • ‘Previously, flight pay was calculated from the moment that blocks are removed from a jet's wheels right before takeoff to the point where wheels are chocked after landing at its destination.’
    • ‘As their aircraft was chocked and chained, I asked them about their downing discrepancy.’
    • ‘The Canadian deck crew chocked and chained the helicopter, we transferred the parts, and signaled for breakdown.’
    • ‘I should have remained armed and completely strapped into my seat until the aircraft was chocked and chained.’
    • ‘If the car is manual transmission, chock the wheels well, remove the emergency brake, and put the car into gear - the higher the gear, the more play the car has.’
    • ‘We finally were chocked and chained when the other H - 46 called inbound, but we quickly advised them to wait until we had fueled and launched.’
    • ‘With the aircraft chocked by the crash crew, my instructor ran through the secure checks from memory, turned off the boost pumps and generators, and tried to secure the engines.’
    1. 1.1 Support (a boat, cask, etc.) on chocks.
      • ‘The problem was on the port side of the airplane and the plane was not chocked and chained.’
      • ‘We chocked the port side and gathered the crew on ICS to talk about what had happened.’
      • ‘Once we were chocked, chained and out of the jet, we saw that we had lost our left shoulder panel, and only two of 34 screws had been set and tightened.’
      • ‘We taxied into our spot to be chocked and chained.’
      • ‘If you're feeling lazy you don't even have to cut the trunk up - just lay it on its side, stake it or chock it to prevent it rolling away, and voilà!’
      • ‘Once the plane was chocked and chained, our flight-deck coordinator came into the aircraft.’


Middle English: probably from an Old Northern French variant of Old French çouche, çoche ‘block, log’, of unknown ultimate origin.