n. & v.
n. 1 a any of various hemipterous insects with oval flattened bodies and mouthparts modified for piercing and sucking. b US any small insect. 2 sl. a micro-organism, esp. a bacterium, or a disease caused by it. 3 a concealed microphone. 4 sl. an error in a computer program or system etc. 5 sl. an obsession, enthusiasm, etc.
v. (bugged, bugging) 1 tr. sl. conceal a microphone in (esp. a building or room). 2 tr. sl. annoy, bother. 3 intr. (often foll. by out) US sl. leave quickly. bug-eyed with bulging eyes.
[ 17th c.: orig. unkn. ]