Definition of crunch adjective from the Oxford Advanced Learner's Dictionary

 

crunch

 adjective
adjective
BrE BrE//krʌntʃ//
 
; NAmE NAmE//krʌntʃ//
 
 
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[only before noun] (informal) a crunch meeting, sports game, etc. is very important and may be the last chance to succeed Sunday’s crunch game with Leeds The Agriculture Secretary goes into a crunch meeting with senior ministers in Brussels tomorrow. Word Origin early 19th cent. (as a verb): variant of 17th-cent. cranch (probably imitative), by association with crush and munch.
See the Oxford Advanced American Dictionary entry: crunch