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

 

to-do

 noun
noun
BrE BrE//tə ˈduː//
 
; NAmE NAmE//tə ˈduː//
 
[singular](informal, becoming old-fashioned)
 
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unnecessary excitement or anger about something synonym fuss What a to-do! He made a great to-do about being left off the guest list. Word Origin late 16th cent.: from to do as in much to do, originally meaning “much needing to be done” but later interpreted as the adjective much and a noun; compare with ado.
See the Oxford Advanced American Dictionary entry: to-do