咔嚓

kāchā
  1. (onom.) breaking or snapping
  2. (coll.) cut it out
  3. stop it
  4. also written 喀嚓 kāchā

CEDICT

onomatopoeic colloquial

Entry Composition

1 咔 kǎ (used as phonetic "ka")
2 嚓 chā
  1. (onom.) used in 喀嚓 kāchā and 啪嚓 pāchā
  2. Taiwan pr. cā