at a moment's notice


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at a moment's notice

With little time to prepare; immediately and at any time. Firefighters need to be able to spring into action at a moment's notice. I can't give a speech at a moment's notice!
See also: notice

at a moment's notice

 and on a moment's notice
with very little advance notice; with just a little bit of warning. They are always asking us to produce reports at a moment's notice.
See also: notice