ひょいと
hyoito

Adverb

1. suddenly; unexpectedly

Onomatopoeia
とり くびをひょいと みず ひたした。
toriwa kubio hyoito mizuni hitashita.
The bird dipped its head into the water.
Adverb

2. by chance; accidentally; casually

Onomatopoeia
Adverb

3. lightly; nimbly; with agility

Onomatopoeia