chock

/tʃɑk/

/tʃɒk/

Other forms: chocks; chocked; chocking

A chock is a wedge of wood or metal that you place behind a wheel to keep a vehicle from rolling. Mechanics often use a chock as a safety measure while they're working on a car.

Even if you've set the parking brake on your car, it's safer to also use a chock while you're working on it to ensure it doesn't move. There are special chocks for motorcycles, airplanes, and heavy trucks. You can also use chock as a verb, to mean "stop from rolling forward." The word's original meaning was "lumpy piece of wood," from Old North French choque, or "block."

Definitions of chock

1. noun

   a block of wood used to prevent the sliding or rolling of a heavy object
   synonyms: wedge

   types:

   sprag

   a chock or bar wedged under a wheel or between the spokes to prevent a vehicle from rolling down an incline

   type of:

   block

   a solid piece of something (usually having flat rectangular sides)
2. verb

   secure with chocks
   type of:

   fasten, fix, secure

   cause to be firmly attached
3. verb

   support on chocks
   “chock the boat”

   type of:

   hold, hold up, support, sustain

   be the physical support of; carry the weight of
4. adverb

   as completely as possible
   “it was chock-a-block full”

   synonyms: chock-a-block