noun

 

illness a bacteria or virus, or the illness that it causes

a flu/stomach bug

 

computer a mistake in a computer program

This program is full of bugs.

 

insect a small insect

 

equipment a small, electronic piece of equipment used to secretly listen to people talking

 

verb

 

listen to hide a piece of equipment somewhere in order to secretly listen to people talking

Their hotel room had been bugged.

 

annoy to annoy someone

He's been bugging me all morning.