E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Imp (Anglo-Saxon).
A graft; whence also a child; as, You little imp. In hawking, to imp a feather is to engraft or add a new feather for a broken one. The needles employed for the purpose were called imping needles. Lord Cromwell, writing to Henry VIII., speaks of that noble imp your son.
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Let us pray for the kings most excellent majesty and for his beloved son Edward, our prince, that most angelic imp.Pathway to Prayer.