|deriŋ|dü, -rēŋ- noun
( plural derrings-do )
Etymology: alteration of Middle English dorring don, durring don daring to do (taken as a noun), from present participle of dorren, durren to dare + don to do — more at dare , do
1. : daring action : daring , courage , bravery
the first airmail flight — a deed of derring-do by an army pilot — Time
2. : bravado
the days of derring-do when swords flashed in rescue of beautiful highborn maidens — J.D.Hart