Meaning

• An insect of the order Hemiptera (the “true bugs”).

• Any of various species of marine or freshwater crustaceans; e.g. a Morton Bay bug, mudbug.

• Any insect, arachnid, or other terrestrial arthropod that is a pest.

  "These flies are a bother. I’ll get some bug spray and kill them."

• Any insect, arachnid, myriapod or entognath.

• (chiefly computing and engineering jargon) A problem that needs fixing.

  "The software bug led the computer to calculate 2 plus 2 as 3."

• A contagious illness; a bacterium or virus causing it

  "He’s got the flu bug."

• An enthusiasm for something; an obsession

  "I caught the skiing bug while staying in the Alps."

• A keen enthusiast or hobbyist.

• A concealed electronic eavesdropping or intercept device

  "We installed a bug in her telephone."

• A small and usually invisible file (traditionally a single-pixel image) on a World Wide Web page, primarily used to track users.

  "He suspected the image was a Web bug used for determining who was visiting the site."

• A small, usually transparent or translucent image placed in a corner of a television program to indicate what network or cable channel is televising it

  "Channel 4's bug distracted Jim from his favorite show."

• A manually positioned marker in flight instruments.

• A semi-automated telegraph key.

• Hobgoblin, scarecrow; anything that terrifies.

• ("the bug") HIV.

• A limited form of wild card in some variants of poker.

• A trilobite.

• A young apprentice jockey.

Meaning

• To annoy.

  "Don’t bug me, I’m busy!"

• To install an electronic listening device or devices in.

  "We need to know what’s going on. We’ll bug his house."

Meaning

• A microfossil, particularly a foraminiferan.