Meaning of BUG in English

BUG

n.

Function: noun

Etymology: origin unknown

Date: 1622

1 a : an insect or other creeping or crawling invertebrate (as a spider or centipede) b : any of several insects (as the bedbug or cockroach) commonly considered obnoxious c : any of an order (Hemiptera and especially its suborder Heteroptera) of insects that have sucking mouthparts, forewings thickened at the base, and incomplete metamorphosis and are often economic pests ― called also true bug

2 : an unexpected defect, fault, flaw, or imperfection <the software was full of bug s >

3 a : a germ or microorganism especially when causing disease b : an unspecified or nonspecific sickness usually presumed due to a bug

4 : a sudden enthusiasm

5 : ENTHUSIAST <a camera bug >

6 : a prominent person

7 : a crazy person

8 : a concealed listening device

9 [from its designation by an asterisk on race programs] : a weight allowance given apprentice jockeys

Merriam Webster Collegiate English Dictionary.      Merriam Webster - Энциклопедический словарь английского языка.