The Collaborative International Dictionary
Impen
Impen \Im*pen"\, v. t. [imp. & p. p. Impennedand Impent; p.
pr. & vb. n. Impenning.]
To shut up or inclose, as in a pen.
--Feltham.
Wiktionary
impen
vb. To shut up or enclose, as in a pen.