As verbs the difference between overpay and overply
is that overpay is to pay too much while overply is to ply to excess; to exert with too much vigour; to overwork.
overpay
English
Verb
To pay too much.
Antonyms
* underpay
overply
English
Verb
To ply to excess; to exert with too much vigour; to overwork.
- (Milton)
(
Webster 1913)