Definition of plumpen in US English:

plumpen

verb

  • 1with object To make plump or bigger; to cause to swell.

  • 2no object To become plump; to grow bigger.

Origin

Late 17th century; earliest use found in Archibald Lovell (fl. 1663–1687). From plump + -en.

Pronunciation

plumpen

/ˈplʌmp(ə)n/