Better late then never, meaning it's better to arrive late than not attending at all.
Break a leg: Good luck!
Call it a day: Stop working on something.
A blessing in disguise: A good thing that seemed bad at first.
A dime a dozen: Something common.
Beat around the bush: Avoid saying what you mean, usually because it is uncomfortable.
Cut somebody some slack: Don't be so critical.
Cutting corners: Doing something poorly in order to save time or money
