Meaning : One of the strands twisted together to make yarn or rope or thread. Often used in combination.
Example :
Three-ply cord.
Four-ply yarn.
Meaning : (usually in combinations) one of several layers of cloth or paper or wood as in plywood.
Meaning : Apply oneself diligently.
Example :
Ply one's trade.
Meaning : Join together as by twisting, weaving, or molding.
Example :
Ply fabric.
Meaning : Wield vigorously.
Example :
Ply an axe.
Meaning : Use diligently.
Example :
Ply your wits!.