at a moment's/minute's notice
Definition of at a moment's/minute's notice
: immediately after one has been told about something They're prepared to help us at a moment's notice. They can be ready to go at a moment's notice.
From the M-W Editors
Word by Word Definitions
: a minute portion or point of time : instant
: a comparatively brief period of time
: present time
: the 60th part of an hour of time : 60 seconds
: the 60th part of a degree of angular measure
: the distance one can traverse in a minute
: to make notes or a brief summary of
: very small : infinitesimal
: of small importance : trifling
: marked by close attention to details
: warning or intimation of something : announcement
: the announcement of a party's intention to quit an agreement or relation at a specified time
: the condition of being warned or notified
: to give notice of
: to comment upon
: review
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