English

Definition of nub noun from the Oxford Advanced Learner's Dictionary

 

nub

 noun
noun
BrE BrE//nʌb//
 
; NAmE NAmE//nʌb//
 
 
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[singular] the nub (of something) the central or essential point of a situation, problem, etc. The nub of the matter is that business is declining. She’s too selfish to help. That’s the nub. Word Origin late 17th cent.: apparently a variant of dialect knub ‘protuberance’, from Middle Low German knubbe, knobbe ‘knob’.
See the Oxford Advanced American Dictionary entry: nub