嚓

chā
  1. (onom.) used in 喀嚓 kāchā and 啪嚓 pāchā
  2. Taiwan pr. cā

CEDICT

onomatopoeic

Homographs

嚓 cā
  1. (onom.) scraping sound
  2. ripping of fabric
  3. screeching of tires