Webster's Revised Unabridged Dictionary · 1913

Imp

Imp (imp) , noun

[Old English imp a graft, Anglo-Saxon impa; akin to Danish ympe, Swedish ymp, prob. from Late Latin impotus, Greek {not transcribed} engrafted, innate, from {not transcribed} to implant; {not transcribed} in + {not transcribed} to produce; akin to English be. See 1st In-, Be.]

1.
A shoot; a scion; a bud; a slip; a graft. [Obsolete] — Chaucer
2.
An offspring; progeny; child; scion. [Obsolete]
The tender imp was weaned. — Fairfax
3.
A young or inferior devil; a little, malignant spirit; a puny demon; a contemptible evil worker.
To mingle in the clamorous fray Of squabbling imps. — Beattie
4.
Something added to, or united with, another, to lengthen it out or repair it, -- as, an addition to a beehive; a feather inserted in a broken wing of a bird; a length of twisted hair in a fishing line. [Obsolete or Provincial English]

Imp , transitive verb

[Anglo-Saxon impian to imp, ingraft, plant; akin to Danish ympe, Swedish ympa, Old High German impfōn, impitōn, German impfen. See Imp, n.]

1.
To graft; to insert as a scion. [Obsolete] — Rom. of R
2.
(Falconry) To graft with new feathers, as a wing; to splice a broken feather.
(Falconry) To repair; to extend; to increase; to strengthen; to equip. [Figurative; Archaic]
Imp out our drooping country's broken wing. — Shakespeare
Who lazily imp their wings with other men's plumes. — Fuller
Here no frail Muse shall imp her crippled wing. — Holmes
Help, ye tart satirists, to imp my rage With all the scorpions that should whip this age. — Cleveland