Definition of ply

• v. t. - To bend.
• v. t. - To lay on closely, or in folds; to work upon steadily, or with repeated acts; to press upon; to urge importunately; as, to ply one with questions, with solicitations, or with drink.
• v. t. - To employ diligently; to use steadily.
• v. t. - To practice or perform with diligence; to work at.
• v. i. - To bend; to yield.
• v. i. - To act, go, or work diligently and steadily; especially, to do something by repeated actions; to go back and forth; as, a steamer plies between certain ports.
• v. i. - To work to windward; to beat.
• v. - A fold; a plait; a turn or twist, as of a cord.
• v. - Bent; turn; direction; bias.