Imp

IMP, noun

1. A son; offspring; progeny.

The tender imp was weaned.

A lad of life, an imp of fame.

2. A subaltern or puny devil.

IMP, verb transitive

1. To graft.

2. To lengthen; to extend or enlarge by something inserted or added; a term originally used by falconers, who repair a hawk's wing by adding feathers.

IMP out our drooping country's broken wings.

--The false north displays

Her broken league to imp her serpent wings.

This verb is, I believe, used only in poetry.