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The definition of a bug is an insect or a defect in something.

(noun)

An example of bug is a beetle.
An example of bug is something that keeps a computer program from working correctly.

Bug is slang meaning to annoy someone.

(verb)

An example of bug is a child asking their parent if they're there yet over and over again during a long road trip.

See bug in Webster's New World College Dictionary

noun

any of an order (Hemiptera) of insects with sucking mouthparts and with forewings thickened toward the base, as a water bug or squash bug
also called true bug
any small arthropod, esp. if regarded as a pest, as a louse, cockroach, or centipede
☆ a defect or imperfection, as in a machine or computer program: somewhat informal when used outside of a computer context
Informal any microscopic organism, esp. one causing disease; germ or virus
☆ Informal a tiny microphone hidden to record conversation secretly
☆ Slang
1. an enthusiast or devotee: often used in combination: a shutterbug pursues photography as a hobby
2. a particular enthusiasm or obsession
☆ Slang a small, compact automobile
Slang the weight allowance (5 pounds, or 2.3 kg) granted to an apprentice jockey for one year after the riding of five winners

Origin: prob. < bug

transitive verb bugged, bugging

Informal to hide a microphone in (a room, etc.), as for recording a conversation secretly
Slang
1. to annoy, bother, anger, etc.
2. to confuse or puzzle

intransitive verb

Slang to bulge or open wide, as in amazement: said of the eyes

noun

Obsolete a bugbear; hobgoblin

Origin: ME bugge, akin to Norw dial. bugge: see big

river in S Ukraine, flowing southeastward into the Black Sea: 530 mi (853 km)
also called Southern Bug
river in W Ukraine, flowing northwestward into the Vistula near Warsaw and forming part of the border with Poland: 500 mi (805 km)
also called Western Bug

See bug in American Heritage Dictionary 4

noun

A true bug.
An insect or similar organism, such as a centipede or an earwig. See Regional Note at lightning bug.
a. A disease-producing microorganism: a flu bug.
b. The illness or disease so produced: “stomach flu, a cold, or just some bug going around” (David Smollar).
a. A defect or difficulty, as in a system or design.
b. Computer Science A defect in the code or routine of a program.
An enthusiasm or obsession: got bitten by the writing bug.
An enthusiast or devotee; a buff: a model train bug.
An electronic listening device, such as a hidden microphone or wiretap, used in surveillance: planted a bug in the suspect's room.

verb bugged bugged, bug·ging, bugs

verb, intransitive

To grow large; bulge: My eyes bugged when I saw the mess.

verb, transitive

a. To annoy; pester.
b. To prey on; worry: a memory that bugged me for years.
To equip (a room or telephone circuit, for example) with a concealed electronic listening device.
To make (the eyes) bulge or grow large.

Phrasal Verbs: bug off Slang To leave someone alone; go away. bug out Slang To leave or quit, usually in a hurry. To avoid a responsibility or duty. Often used with on or of: bugged out on his partners at the first sign of trouble.

Origin:

Origin: Origin unknown

Related Forms:

bugˈger noun

also Western Bug A river of eastern Europe rising in southwest Ukraine and flowing about 772 km (480 mi) through Poland to the Vistula River near Warsaw.
also Southern Bug A river of southern Ukraine rising in the southwest part and flowing about 853 km (530 mi) generally southeast to the Black Sea.

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