English

Definition of straight arrow noun from the Oxford Advanced Learner's Dictionary

 

straight arrow

 noun
noun
BrE BrE//ˌstreɪt ˈærəʊ//
 
; NAmE NAmE//ˌstreɪt ˈæroʊ//
 
(North American English, informal)
 
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a person who is very honest or who never does anything exciting or different
See the Oxford Advanced American Dictionary entry: straight arrow