Definition of chock in US English:



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

    • ‘He ran alongside the main landing gear and attempted to insert a chock under the main tire.’
    • ‘The noise sounded like the familiar slamming of a crew door after the chocks are pulled, before shore-based taxiing.’
    • ‘We looked for the leak, and I noticed the lineman did not put in the chocks after shutdown - the aircraft started inching aft.’
    • ‘One sees the wood chocks pulled away, the biplane taxiing on grass out into the middle distance.’
    • ‘See that master ignition switches and individual ignition switches are off, set parking brakes and have the ground crew remove the wheel chocks.’
    • ‘With the deck-status light flashing green, I signaled the LSE to remove chocks and chains.’
    • ‘The chocks were removed, and engines three and four were started.’
    • ‘Ken signaled for the ground crew to pull the chocks.’
    • ‘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.’
    • ‘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.’
    • ‘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.’
    • ‘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.’
    • ‘The chocks under the wheels of the Juggernaut of state control have been well and truly blown away this week.’
    • ‘I had failed to turn off the ignition and to install chocks on the van.’
    • ‘Finally, some Chief came over, pulled the chocks and had my plane moved to the aft elevator.’
    • ‘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.’
    • ‘He must keep an eye on the helicopter, monitoring the installing or removal of chocks and tiedown chains.’
    • ‘The controlling yellowshirt signaled the blueshirts to install chocks and tie-down chains.’
    • ‘Remember, the approach isn't really over until the chocks are in.’
    • ‘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.’
    tapered block, door stop
    View synonyms
    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.
      • ‘Thinking on their feet, the technicians positioned a maintenance stand with a wooden chock under the housing to hold the pump in position.’
      • ‘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.’
      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.

    • ‘Where your lines go through chocks, they will need chafing gear.’
    • ‘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.’
    • ‘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.’
    • ‘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.’


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

    • ‘Airman Niedermayer stood next to the Crew Chief, as the rest of the Air Force team chocked the aircraft.’
    • ‘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.’
    • ‘While awaiting maintenance arrival, Airmen Green and Helton continued patrolling the area to verify that all aircraft were chocked.’
    • ‘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.’
    • ‘I should have remained armed and completely strapped into my seat until the aircraft was chocked and chained.’
    • ‘For having to do some of the worst jobs on the flight deck - cleaning, chocking and chaining - they keep in really good spirits.’
    • ‘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.’
    • ‘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.’
    • ‘As their aircraft was chocked and chained, I asked them about their downing discrepancy.’
    • ‘Then, with the aircraft chocked, pinned, and tailwheel locked, we started over on the taxi checklist and eventually completed the mission.’
    • ‘The Canadian deck crew chocked and chained the helicopter, we transferred the parts, and signaled for breakdown.’
    • ‘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.’
    • ‘The driver chocked front wheel with an aluminum wedge roped to the cab and went around to the back of the truck.’
    • ‘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.’
    1. 1.1 Support (a boat, cask, etc.) on chocks.
      • ‘Once the plane was chocked and chained, our flight-deck coordinator came into the aircraft.’
      • ‘We chocked the port side and gathered the crew on ICS to talk about what had happened.’
      • ‘The problem was on the port side of the airplane and the plane was not 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!’
      • ‘We taxied into our spot to be chocked and chained.’
      • ‘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.’


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