taru-adjective, adverb taking the 'to' particle
quick; prompt; without hesitation
Describes acting or responding quickly and smoothly, often with a sense of being unflustered. Used adverbially with と.
彼は質問にシャシャと答えた。
He answered the question promptly.
taru-adjective, adverb taking the 'to' particle
Describes something done in a simple, neat, or uncluttered manner. Often used for tasks or appearances. Adverbial use with と.
彼女は部屋をシャシャと片付けた。
She tidied up the room neatly.
The origin is uncertain. It may be a mimetic word, but the exact derivation is unclear.