From Longman Dictionary of Contemporary Englishchockchock /tʃɒk $ tʃɑːk/ noun [countable] TTAa block of wood or metal that you put in front of the wheel of a vehicle to prevent it from moving
Examples from the Corpus
chock• We are in a saloon-style house chock full of Wild West memorabilia.• Yet you may have a list chock full of interesting points with only slight degrees of greater importance.• Some modern footgear and small sized chocks would have been better than acid drops on that day!• Planes can't take off without the rigger there to pull away the chocks.• Would we leave a thing like that when any kiddy could knock the chocks out or set light to it?• He pulled the chocks out from under the airplane's wheels.• He removes the chocks and starts the plane by hand.• The engine noise rose, the chocks were pulled.Origin chock (1300-1400) Probably from an unrecorded Old North French choque 