Definition of crunch adjective from the Oxford Advanced American Dictionary

 

crunch

 adjective
adjective
NAmE//krʌntʃ//
 
[only before noun](informal)
 
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a crunch meeting, sports game, etc. is very important and may be the last chance to succeed Sunday's crunch game against San Francisco The Secretary of Agriculture goes into a crunch meeting with senior advisers tomorrow.
See the Oxford Advanced Learner's Dictionary entry: crunch