Definition of caulk in English:


(US calk)


mass noun
  • A waterproof filler and sealant, used in building work and repairs.

    ‘use silicone caulk to ensure that you have an all-season moisture seal’
    • ‘The caulk is usually heavily loaded with filler and relies on either linseed or soybean oil as its binder.’
    • ‘Apply the caulk to the tub edges and smooth it with your finger.’
    • ‘A. One-hundred percent silicone caulk or sealant will not take paint of any sort.’
    • ‘If small holes are found, you can repair them with caulk or polyethylene or foil tape.’
    • ‘In a corner, run a bead of latex caulk down, smoothing it in with your finger.’
    • ‘The caulk and caulking gun that my mom bought me five years ago have finally come in handy.’
    • ‘Seal joints between the wall and your new tub with silicone caulk as protection against water seepage.’
    • ‘And just as caulk is the first and best way to conserve heat, stopping leaks and drips is the first way to save water.’
    • ‘Remove any excess caulk or plumber's putty and reinstall the cabinet doors to complete the project.’
    • ‘They will eat almost anything, including caulk and adhesives, but they particularly like greasy materials.’
    • ‘If you plan to reuse the sink, set it down on an old towel to protect the porcelain while you remove the old caulk with the putty knife and clean it up.’
    • ‘Next, drive a screw into the nozzle end of the hardened caulk and use the screw to pull the hardened caulk out of the nozzle.’
    • ‘On the interior, apply caulk around your window and door glass and trim.’
    • ‘It is never good practice to apply caulk in very cold or very hot weather.’
    • ‘Seal the base of the toilet bowl with plumber's putty or silicone caulk.’
    • ‘If the seal has failed, carefully scrape out the old caulk and loose paint.’
    • ‘Clean away all old caulk and loose paint with a wire brush or rag.’
    • ‘You will then want to make sure that the grout or caulk around the sink is also clean.’
    • ‘Seal this joint with acrylic latex exterior caulk and check it every year.’
    • ‘Applying and maintaining silicone caulk around window and door openings also plays a vital role in keeping moisture out.’


[with object]
  • 1Seal (a gap or seam) with caulk.

    ‘caulk all cracks between the trim and siding or masonry’
    • ‘If your home has a stucco exterior, caulk any cracks.’
    • ‘‘We had seen impressions of these vertical wooden planks in Roman concrete, and wondered if the cracks between planks had to be caulked to prevent concrete leakage,’ he said.’
    • ‘Then something banged against the inside wall where Dennis was caulking.’
    • ‘In the bathroom: Shower doors should be caulked and sealed properly to prevent leaking.’
    • ‘The seams were caulked with tow, which I procured from untwisted ropes.’
    • ‘Be sure there is a tightly caulked seal around the edge of the storm windows.’
    • ‘Even if you think the crack is too small, caulk it anyway.’
    • ‘I cleaned rooms, laundered bedding, caulked around storm windows, shoveled snow, and rented rooms to travelers and lovers.’
    • ‘Walk around the outside of your home or apartment, and slowly examine the windows, doors, siding, water faucets and any other through-the-wall openings. Any such cracks or openings should be caulked and sealed.’
    • ‘This must be carefully and completely caulked to seal it against energy loss.’
    • ‘At Brooker Creek Elementary School, plant operators were caulking the seams left when aluminum awnings over the doors were ripped away from several portable classrooms.’
    • ‘You should plug and caulk holes or penetrations for faucets, pipes, electric outlets, and wiring.’
    • ‘We suggest you also caulk around each hole to prevent water from creeping in and rotting the siding.’
    • ‘Seal the finishing material well with tile grout, and caulk all the joints to prevent water damage.’
    • ‘Check the roof vents and access hatch, and caulk any cracks where flashing meets the roof line.’
    • ‘Weatherstrip and caulk around windows, and seal all cracks and crevices.’
    • ‘So they fastened boards on either side of the banister and caulked and painted to fill in.’
    • ‘Seal the cracks with caulking and then apply a good coat or two of paint.’
    • ‘Let's face it, if you want to get those energy bills down this winter, you may need to do more than just caulk and weather strip.’
    • ‘The joints should be caulked to prevent leaks, and the hangers should be secure to the fascia.’
    block up, bung up, stop, stop up, plug, seal, close, clog, clog up, choke, obstruct, occlude, dam up
    View synonyms
    1. 1.1 Make (a boat) watertight by stopping up any gaps in its hull.
      ‘a garden must be cleared, boats caulked, and nets mended’
      • ‘The obscure gray water is dotted with fishing boats, which brush the calm surface, each caulked with a paste of alchemical silvers.’
      • ‘Within two minutes of ordering appetizers, our party was inundated with marshmallow-size gnocchi and enough gooey risottos to caulk a ship.’
      • ‘By the beginning of December Challenger was newly rigged, freshly caulked and painted, and fitted with a new deck house for the comfort of the Scientifics.’
      • ‘Eventually, the museum will caulk and paint Surprise to make her seaworthy.’


Late Middle English (in the sense ‘copulate’, used of birds): from Old Northern French cauquer, caukier, variant of cauchier ‘tread, press with force’, from Latin calcare ‘tread’, from calx, calc- ‘heel’.