English

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

 

breakneck

 adjective
adjective
BrE BrE//ˈbreɪknek//
 
; NAmE NAmE//ˈbreɪknek//
 
[only before noun]
 
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very fast and dangerous to drive, etc. at breakneck speed We drove to the hospital at breakneck speed.Extra examples We drove to the hospital at breakneck speed.
See the Oxford Advanced American Dictionary entry: breakneck