Definition of derring-do noun from the Oxford Advanced Learner's Dictionary

 

derring-do

 noun
noun
BrE BrE//ˌderɪŋ ˈduː//
 
; NAmE NAmE//ˌderɪŋ ˈduː//
 
[uncountable](old-fashioned, humorous) Brave
 
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brave actions, like those in adventure stories tales of derring-do See related entries: Brave Word Origin late 16th cent.: from late Middle English dorryng do ‘daring to do’, used by Chaucer, and, in a passage by Lydgate based on Chaucer's work, misprinted in 16th-cent. editions as derrynge do; this was misinterpreted by Spenser to mean ‘manhood, chivalry’, and subsequently taken up and popularized by Sir Walter Scott.
See the Oxford Advanced American Dictionary entry: derring-do