on a moment's notice

Immediately and without any prior warning or time to prepare. Firefighters need to be able to spring into action on a moment's notice. I can't just give a speech in front of the whole school on a moment's notice!

See also: notice, on

See also:

at a moment's notice
spring into action
spring to/into life/action
go into action
at short notice
notice
land in on
no one will be (any) the wiser
give notice
behoove

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