丁々

ちょうちょう, とうとうchouchou

adverb · 'taru' adjective

1. (sound of) hitting repeatedly
2. pummelling
3. clashing
4. clacking
5. clicking (e.g. of go stones)
6. with a chopping sound (of an axe)
7. with a thump (when hammering a post into the ground)

Study it in Yanamino