English

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

 

boss

 adjective
adjective
BrE BrE//bɒs//
 
; NAmE NAmE//bɔːs//
 
, NAmE//bɑːs//
 
 
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(especially North American English, slang) very good She's a real boss chick. Word Origin early 19th cent. (originally US): from Dutch baas ‘master’.
See the Oxford Advanced American Dictionary entry: boss