at a moment's notice
Immediately; instantaneously; without need of warning.
The soldiers were ready at a moment's notice.
notice
UK /ˈnəʊ.tɪs/ US /ˈnoʊ.tɪs/
noun 5verb 4
Definitions
noun
1
The act of observing; perception.
He took no notice of the changes, and went on as though nothing had happened.
Athelstan Arundel walked home[…], foaming and raging. […] He walked the whole way, walking through crowds, and under the noses of dray-horses, carriage-horses, and cart-horses, without taking the least notice of them.
2
A written or printed announcement.
A series of notices signpost patients to the X-ray department.
A notice was attached to the building reminding the residents about the five hour water shortage that was happening today.
3
A formal notification or warning.
The sidewalk adjacent to the damaged bridge stonework shall be closed until further notice.
4
Advance notification of termination of employment, given by an employer to an employee or vice versa.
I gave her her mandatory two weeks' notice and sacked her.
I can't work here any longer. I'm giving notice.
5
A published critical review of a play or the like.
The first-night audience, yes. The first-night reviewers, not exactly. The notices have so far been mixed, only The Financial Times having delivered itself of an unequivocal rave.
verb
1
To remark upon; to mention.
Numberless are the arguments […] that men have used morally and physically, to degrade the sex. I must notice a few.
2
To become aware of; to observe.
Did you notice the flowers in her yard?
So you punched out a window for ventilation. Was that before or after you noticed you were standing in a lake of gasoline?
3
To lavish attention upon; to treat (someone) favourably.
She would notice her; she would improve her; she would detach her from her bad acquaintance, and introduce her into good society; she would form her opinions and her manners.
4
To be noticeable; to show.
The blackness didn't notice so much when she was born; but it's unmistakeable now.
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