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

 

tough

 noun
noun
BrE BrE//tʌf//
 
; NAmE NAmE//tʌf//
 
 
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(old-fashioned, informal) a person who regularly uses violence against other people Word Origin Old English tōh, of Germanic origin; related to Dutch taai and German zäh.
See the Oxford Advanced American Dictionary entry: tough