chock

noun

• a wedge or block placed against a wheel or rounded object, to prevent it from moving: their aircraft stood gently shuddering against their chocks
• a support for a rounded structure, such as a cask or the hull of a boat.

• 1a ring with a gap at the top, through which a rope or line is run.

verb

• prevent the movement of (a wheel or vehicle) with a chock:the front wheel will need to be chocked
• support (a boat, cask, etc.) on chocks: outside, chocked up on the waterfront, was a yacht