Informal. a word that is hard to pronounce. a very hard, usually round, candy. Also called jaw crusher. Mining. a machine used to break up ore, consisting of a fixed plate and a hinged jaw moved by a toggle .
The Blake jaw crusher uses a double toggle to move the swinging jaw and is built in a variety of sizes from laboratory units to large sizes having a feed inlet 84 by 120 in. (213 by 305 cm). The Dodge jaw crusher uses a single toggle or eccentric and is generally built in smaller sizes.