jawbreaker

noun

1. A large, extremely hard, boiled candy, typically spherical.

   “If somebody microwaves a large jawbreaker and nibbles on the outside, a crack can cause molten candy to burst out and cause painful burns. Exploding jawbreakers have been documented on television news and in police reports.”

2. A long, hard-to-pronounce word.

   “The word “callipygous” is something of a jawbreaker.”

3. (slang)A hard blow to the side of the face.

   “Bendoff went pluckily forward, but only to receive a jawbreaker from Couper's left, […]”