kā chā
(onom.) breaking or snapping
(coll.) cut it out; stop it; also written 喀嚓[ka1 cha1]
咔
kā
(used as phonetic "ka")
嚓
chā
(onom.) used in 喀嚓[ka1 cha1] and 啪嚓[pa1 cha1]