むっくり

Etymology
Part of a cluster of related adverbs deriving from mimetic root.

First attested in a text from the early 1600s.

Adverb

 * 1)  abruptly
 * 2)  plump, rotund, swollen
 * 1)  plump, rotund, swollen

Usage notes
Regarding the sense,  indicates a somewhat slower action than synonym.

Verb

 * 1) to become plump, to be rotund