An insect of the order Hemiptera (the “true bugs”).
Any of various species of marine or freshwater crustaceans; e.g. a Moreton Bay bug, mudbug.
(informal) Any insect, arachnid, or other terrestrial arthropod that is a pest.
(informal) Any minibeast.
(US) Any insect, arachnid, myriapod or entognath.
(UK, obsolete, specifically) A bedbug.
(jargon) A problem that needs fixing.
A contagious illness, or a pathogen causing it.
(informal) An enthusiasm for something; an obsession.
(informal) A keen enthusiast or hobbyist.
A concealed electronic eavesdropping or intercept device.
A small and usually invisible file (traditionally a single-pixel image) on a World Wide Web page, primarily used to track users.
(Maine) A lobster.
A small, usually transparent or translucent image placed in a corner of a television program to identify the broadcasting network or cable channel.
A manually positioned marker in flight instruments.
A semi-automated telegraph key.
(obsolete) Hobgoblin, scarecrow; anything that terrifies.
HIV.
A limited form of wild card in some variants of poker.
(slang) A trilobite.
(US, dated, slang) Synonym of oil bug.
(US, slang) An asterisk denoting an apprentice jockey's weight allowance.
(US, broadly, slang) A young apprentice jockey.
Synonym of union bug.
(slang) A small piece of metal used in a slot machine to block certain winning combinations.
(slang) A metal clip attached to the underside of a table, etc. to hold hidden cards, as a form of cheating.

(informal, transitive) To annoy.
(informal, intransitive) To act suspiciously or irrationally, especially in a way that annoys others.
(transitive) To install an electronic listening device or devices in.
(intransitive) To bulge or protrude.
(transitive) To represent (a value) using a bug on an instrument.

bugging

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