adverb taking the 'to' particle, adverb
smoothly; without resistance; easily
Describes an action that proceeds without hindrance, often with a light, effortless feel. Common in casual speech.
新しいソフトはすっすっと動く。
The new software runs smoothly.
彼はすっすっと難しい問題を解いた。
He solved the difficult problem with ease.
A reduplicative mimetic word; the exact origin is uncertain, but it likely derives from the sound-symbolic element すっ associated with smooth, swift movement.