jaw-breaker

noun

1. Informal. a word that is hard to pronounce.
2. a very hard, usually round, candy.
3. 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 joint.

noun

1. Also called: jawcrusher a device having hinged jaws for crushing rocks and ores
2. informal a word that is hard to pronounce

n.

also jawbreaker 1839, “word hard to pronounce” (jawbreakingly, in reference to pronouncing words, is from 1824), from jaw (n.) + agent noun from break (v.). As a type of candy, by 1911.