Don’t switch off now
Maybe a teacher will say to her students, don’t switch off – this bit is important! She means, don’t go to sleep now – stay awake and think about this.
That doesn’t cut it
If something cuts it for you, then it is good enough for you, but if something doesn’t cut it, then it is not good enough. For example, email doesn’t cut it if a group of people want to share information – QQ is more convenient.
Coffee doesn’t really cut it when you haven’t slept for days – I need something stronger to wake me up!
Using printed advertising doesn’t cut it anymore – you need a website.
She said sorry but it didn’t cut if for me, because I didn’t think she meant it.
Give yourself a pat on the back
This means, “Well done” or “congratulate yourself”. “Patting (拍) your back” means touching your back gently and repeatedly as a way of saying, “that was a good job”. For instance, a teacher might say,
Give yourself a pat on the back if you got question 4 right, because it was a difficult one.
Give yourself a pat on the back for getting to class today – the weather was really bad so well done.