Where does the word “manure” come from and What does manure mean in French?

The word “manure” was originally a verb, its origin the Old French verb manouvrer.

Thus, in the fourteenth century, it meant “to work by hand; especially, to work the soil by hand; to cultivate the soil.”

From that came the noun, which at first meant “that which may be worked by hand; the action of cultivating the soil.”

Our present meaning was a later extension.