noun

1. BUG, a minute life form (especially a disease-causing bacterium); the term is not in technical use
2. BUG, general term for any insect or similar creeping or crawling invertebrate
3. BUG, insects with sucking mouthparts and forewings thickened and leathery at the base; usually show incomplete metamorphosis
4. BUG, a small hidden microphone; for listening secretly
5. BUG, a fault or defect in a computer program, system, or machine

verb

1. BUG, annoy persistently
2. BUG, tap a telephone or telegraph wire to get information