ひょいと

ひょいと〈動どう詞し〉to suddenly do (something), out of nowhere
彼かれはひょいと顔かおを出だした。
He suddenly popped his head in.
ひょいと〈物もの〉を拾ひろうto casually pick something up
道みち端ばたでひょいと小こ石いしを拾ひろった。
I casually picked up a pebble by the road.
ひょいと飛とび越こえるto nimbly hop or leap over (something)
猫ねこは塀へいをひょいと飛とび越こえた。
The cat nimbly leapt over the wall.

Related words

太ふと sense 1
ふと and ひょいと both mean 'suddenly' or 'unexpectedly', but ふと is used mainly for sudden thoughts or realizations while ひょいと usually describes a sudden physical action.
軽かろやか sense 3
軽やか describes something as light and graceful in a general sense, while ひょいと specifically emphasizes the quick, effortless moment of a nimble action.
突とつ然ぜんN3sense 1
突然 is a more formal, neutral word for 'suddenly', while ひょいと has a lighter, more casual nuance often tied to a quick physical motion.
ぽい
ひょいと describes a quick, light, unthinking action (like picking something up or moving), while ぽいと focuses specifically on a careless tossing motion.

Don't confuse with

ひょっとN1
ひょっと looks and sounds similar to ひょいと but means 'by any chance' (as in ひょっとして), not 'suddenly' or 'nimbly'.

Etymology

Mimetic word; the exact origin is uncertain, but it likely derives from the sound-symbolic root ひょい, which suggests a quick, light, or sudden movement.