Catch someone red-handedIf someone is caught red-handed, they are found doing something wrong or illegal. Chapter and verse When you know something very well, and can quote it, you know it chapter and verse. Cheap as chips (UK) If something is very inexpensive, it is as cheap as chips. Cheap at half the price If something's cheap at half the price, it's very cheap indeed. Cheap shot A cheap shot is an unprincipled criticism. Chinese walls Chinese walls are regulatory information barriers that aim to stop the flow of information that could be misused, especially in financial corporations. Clean as a whistle If something is as clean as a whistle, it is extremely clean, spotless. It can also be used to mean 'completely', though this meaning is less common nowadays. If somebody is clean as a whistle, they are not involved in anything illegal. Cloud on the horizon If you can see a problem ahead, you can call it a cloud on the horizon. Collateral damage Accidental or unintended damage or casualties are collateral damage. Collect dust If something is collecting dust, it isn't being used any more. Come out of your shell If someone comes out of their shell, they stop being shy and withdrawn and become more friendly and sociable.
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