adverb taking the 'to' particle, noun or participle which takes 'suru'
Describes a state of constant, small movements or bustling activity, often with a sense of unease or lack of calm. Used adverbially with と or as a する-verb.
彼は待合室でわさわさと動いていた。
He was fidgeting restlessly in the waiting room.
The children are bustling about and I can't relax.