also: ずっぽり · ずっぽし
adverb, adverb taking the 'to' particle
entirely; completely; all the way
Describes something being fully covered, enveloped, or immersed. Often used with verbs like かぶる, はまる, 包む, or 覆う. It is especially for being covered in something.
帽子をすっぽりかぶった。
I put on a hat that covered my head completely.
指に指輪がすっぽりはまった。
The ring fit snugly all the way onto my finger.
adverb, adverb taking the 'to' particle
Describes something fitting precisely into or being removed cleanly from a space, like a lid, plug, or object in a container. This is especially for insertion or removal.
瓶の栓がすっぽり抜けた。
The bottle's stopper came out cleanly.
箱に本がすっぽり収まった。
The book fit snugly into the box.