Definition of "wag" in English

verb

1. To swing from side to side, as an animal's tail, or someone's head to express disagreement or disbelief.

2. (UK, Australia, New Zealand, slang) To play truant from school.

3. (intransitive, chiefly obsolete) To go; to proceed; to move; to progress.

4. To move continually, especially in gossip; said of the tongue.

   • She's a real gossip: her tongue is always wagging.

5. (intransitive, obsolete) To leave; to depart.

6. (intransitive, cricket, slang) Of the tail (lower order of the batting lineup): to score more runs than expected.

   • The tail wagged.

noun

1. An oscillating movement.

   • The wag of my dog's tail expresses happiness.

2. A witty person.