Meaning of ply
Definition of ply
(noun)
one of the strands twisted together to make yarn or rope or thread; often used in combination; "three-ply cord"; "four-ply yarn"
(verb)
give what is desired or needed, especially support, food or sustenance; "The hostess provided lunch for all the guests"
apply oneself diligently; "Ply one's trade"
wield vigorously; "ply an axe"
use diligently; "ply your wits!"