Ply2  v. (-ies, -ied) 1 use or wield (a tool, weapon, etc.). 2 work steadily at (ply one's trade). 3 (foll. By with) a supply continuously (with food, drink, etc.). B approach repeatedly (with questions, etc.). 4 a (often foll. By between) (of a vehicle etc.) Travel regularly to and fro. B work (a route) thus. 5 (of a taxi-driver etc.) Attend regularly for custom (ply for hire). [from *apply]