1. to work steadily at something
2. to supply someone persistently with something
3. to travel regularly over a route

1. a layer or thickness of material

Examples

• The carpenter plied his trade for forty years.
• She plied her guests with food and drinks all evening.
• The ferry plies between the mainland and the island daily.
• This rope is made of three-ply construction.
• He plied the witness with questions during cross-examination.
• The taxi driver plies the busy downtown route.
• Two-ply toilet paper is softer than single-ply.