がん
gan

To-Adverb

1. with a thump; with a thud; with a bang

Onomatopoeia
To-Adverb

2. hard (hit, scold, etc.); severely

Onomatopoeia
Noun

3. marking (on a card or tile for the purpose of cheating); card marking; tile marking; alteration

Mahjong
Hanafuda
Other forms: