ply

one of the strands twisted together to make yarn or rope or thread; often used in combination; "three-ply cord"; "four-ply yarn"

(usually in combinations) one of several layers of cloth or paper or wood as in plywood

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"

travel a route regularly; "Ships ply the waters near the coast"

join together as by twisting, weaving, or molding; "ply fabric"

wield vigorously; "ply an axe"

use diligently; "ply your wits!"