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

 

gut

 adjective
adjective
BrE BrE//ɡʌt//
 
; NAmE NAmE//ɡʌt//
 
 
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[only before noun] based on feelings and emotions rather than thought and reason a gut feeling/reaction You have to work on gut instinct. Word Origin Old English guttas (plural), probably related to gēotan ‘pour’.
See the Oxford Advanced American Dictionary entry: gut