Definition of wag

• v. t. - To move one way and the other with quick turns; to shake to and fro; to move vibratingly; to cause to vibrate, as a part of the body; as, to wag the head.
• v. i. - To move one way and the other; to be shaken to and fro; to vibrate.
• v. i. - To be in action or motion; to move; to get along; to progress; to stir.
• v. i. - To go; to depart; to pack oft.
• v. - The act of wagging; a shake; as, a wag of the head.
• v. - A man full of sport and humor; a ludicrous fellow; a humorist; a wit; a joker.