1 a paper cylinder both ends of which are pulled at Christmas etc. making a sharp noise and releasing a small toy etc.
2 a firework exploding with a sharp noise.
3 (usu. in pl.) an instrument for cracking (nutcrackers).
4 a thin dry biscuit often eaten with cheese.
5 sl. Brit. a notable or attractive person.
6 US a biscuit.
7 US offens. = poor White.
Phrases and idioms:
cracker-barrel US (of philosophy etc.) homespun; unsophisticated.
Useful english dictionary. 2012.