咔嚓

咔嚓	kā chā	(onom.) breaking or snapping / (coll.) cut it out / stop it / also written 喀嚓
咔	kǎ	(used as phonetic "ka")
嚓	cā	(onom.) scraping sound / ripping of fabric / screeching of tires
嚓	chā	(onom.) used in 喀嚓 and 啪嚓 / Taiwan pr. [ca1]