They've been trying to work/get the 'bugs' out of the system. [=trying to fix the system's problems]
He was first bitten by 'the' acting 'bug' [=he first became interested in acting] when he was 18.
Her legs were covered in 'bug' bites. [=itchy or painful wounds from insects]
(..) without any sugar in it, okay? Something without sugar. BIFF: McFly. What are you doing? Biff. I'm talking to you, McFly, you Irish bug! GEORGE: Biff. Guys. How are you doing? BIFF: You got my homework finished? Actually, I figured since it wasn't due 'til Monday... Hello? Hello? Anybody home? (..)1985 Back to the Future