crunch time
noun /ˈkrʌntʃ taɪm/
  /ˈkrʌntʃ taɪm/
[uncountable] (informal)- an important moment or busy time when you must make a decision or take action
- it is crunch time (for somebody/something) It's crunch time for students who want to graduate early.
 - at crunch time The team relies on you to deliver at crunch time.
 - in crunch time Having an elite quarterback who can win you the game in crunch time is essential.