The Collaborative International Dictionary of English v.0.48:
Ply \Ply\, v. t. [imp. & p. p. Plied; p. pr. & vb. n.
Plying.] [OE. plien, F. plier to fold, to bend, fr. L.
plicare; akin to Gr. ?, G. flechten. Cf. Apply, Complex,
Display, Duplicity, Employ, Exploit, Implicate,
Plait, Pliant, Flax.]
1. To bend. [Obs.]
As men may warm wax with handes plie. --Chaucer.
2. To lay on closely, or in folds; to work upon steadily, or
with repeated acts; to press upon; to urge importunately;
as, to ply one with questions, with solicitations, or with
And plies him with redoubled strokes --Dryden.
He plies the duke at morning and at night. --Shak.
3. To employ diligently; to use steadily.
Go ply thy needle; meddle not. --Shak.
4. To practice or perform with diligence; to work at.
Their bloody task, unwearied, still they ply.