The noun bug has 5 senses (first 1 from tagged texts)
1. (1) bug -- (general term for any insect or similar creeping or crawling invertebrate)
2. bug, glitch -- (a fault or defect in a system or machine)
3. bug -- (a small hidden microphone; for listening secretly)
4. hemipterous insect, bug, hemipteran, hemipteron -- (insects with sucking mouthparts and forewings thickened and leathery at the base; usually show incomplete metamorphosis)
5. microbe, bug, germ -- (a minute life form (especially a disease-causing bacterium); the term is not in technical use)
Overview of verb bug
The verb bug has 2 senses (first 1 from tagged texts)
1. (1) tease, badger, pester, bug, beleaguer -- (annoy persistently; "The children teased the boy because of his stammer")
2. wiretap, tap, intercept, bug -- (tap a telephone or telegraph wire to get information; "The FBI was tapping the phone line of the suspected spy"; "Is this hotel room bugged?")