idioms

  over your head (too difficult or complex for you to understand) I laughed to be polite, but the joke went right over my head. She is pretty good at math, but calculus is way over her head.   envocabulary.com

  play for time (to delay something until you are ready) I was playing for time so I could collect my thoughts. What you can do is play for time until the police arrive.   envocabulary.com

  do time  informal (to be in prison) If you continue to steal, you will end up doing time again. You will do time unless you tell me the truth.  He has done time for bank robbery.   envocabulary.com

  sharp as a tack (extremely clever) Jane is sharp as a tack. I’m sure she’ll find a solution to this problem. Mike may be old, but he is still as sharp as a tack.   envocabulary.com

  bag of tricks  informal (a set of skills, techniques, or resources) I will have to use everything in my bag of tricks to fix this problem. The new coach is using a whole new bag of tricks to strengthen the team.   envocabulary.com