snap
vb
1 break, come apart, crack, give way, separate
2 bite, bite at, catch, grip, nip, seize, snatch
3 bark, flare out, flash, fly off the handle at (informal) growl, jump down (someone's) throat (informal) lash out at, retort, snarl, speak sharply
5 snap one's fingers at cock a snook at (Brit.) defy, flout, pay no attention to, scorn, set at naught, wave two fingers at (slang)
6 snap out of it cheer up, get a grip on oneself, get over, liven up, perk up, pull oneself together (informal) recover
n
7 crackle, fillip, flick, pop
9 (informal) energy, get-up-and-go (informal) go (informal) liveliness, pep, pizzazz or pizazz (informal) vigour, zip (informal)
adj
10 abrupt, immediate, instant, on-the-spot, sudden, unpremeditated