English

impen

From im- + pen.

Formed from in- + pen

Proto-Indo-European *h₁én ‘in’

Proto-Germanic *in ‘into’

English in-

Proto-Indo-European *peth₂- ‘to rush, fly’

…

Latin penna ‘feather’

Old French penne

Anglo-Norman penne

Middle English penne

English pen

Today it means

verb To shut up or enclose, as in a pen.

Language periods are conventional ranges, not dates for this word.