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

 

chicken

 adjective
adjective
BrE BrE//ˈtʃɪkɪn//
 
; NAmE NAmE//ˈtʃɪkɪn//
 
Brave
 
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[not before noun] (informal) not brave; afraid to do something synonym cowardly See related entries: Brave Word Origin Old English cīcen, cȳcen, of Germanic origin; related to Dutch kieken and German Küchlein, and probably also to cock.
See the Oxford Advanced American Dictionary entry: chicken