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]
(..) I couldn't give you the money if I wanted to. My funds are in Liverpool, not in Atlanta. If I tried drawing a draft, the Yankees'd be on me like a duck on a June bug. So you see, my dear, you've abased yourself to no purpose. Here, here, here, stop it! Want the Yankees to see you like this? (..)1939 Gone with the Wind