1. the ball is in your court. (meaning: it's someone else's turn to make a move)
2. skating on thin ice (meaning: someone is doing something risky that may have serious consequences)
3. Don't throw in the towel (meaning: to give up on doing something because you can't succeed)
4. swims against the tide (meaning: to say or do something which is the opposite of what other people are doing)
5. jumped the gun (meaning: to do something too soon without really thinking about it)
6. get into the swing of it (meaning: to become used to a situation)