탕 + 하고 울리다 / 소리가 나다; 탕탕 (repeated)
bang (gunshot); clang
Example
밖에서 갑자기 탕 하고 총소리가 났어요.
Suddenly there was a bang of a gunshot outside.
Word parts
의성어 (sound word) for a sharp bang, like a gunshot or a door slammed shut.
Good to know
Repeat it for several shots: 탕탕. Also used for slamming: 문을 탕 닫았어요.
Related words