Wiktionary
prep.phr. (context idiomatic English) immediately; instantaneously; without need of warning.
Usage examples of "at a moment's notice".
Or maybe they just needed to be able to get back inside at a moment's notice.
A situation such as you deserve, and your friends would require for you, is no everyday occurrence, is not obtained at a moment's notice.
The smell of hot metal remained to assure us that the light was still there, ready to flash out at a moment's notice.
With daily news of her granddaughter she could stay on without anxiety at Ragatz, and be ready to go to Clara at a moment's notice.
It is no light thing for a man to drop everything at a moment's notice to travel far, even in answer to a call from help from an old friend.
Hawksmoor assured his organic companions that the yacht, even half crippled as it was, would be able to break free at a moment's notice.
His blaster rifle was tucked securely under his arm, ready to be brought into play at a moment's notice.
He had gone off at a moment's notice with this stranger, and no word has come from him since.
When needed, the dragoons were backed up by all of the Constantinople cataphracts, ready to sally at a moment's notice.
He will lecture comprehensively and at a moment's notice on the importance of our findings as they relate to the problem—.
Make sure everything is in operating order, and make sure it can come on line at a moment's notice.
And he'll probably have a security force ready to beam down at a moment's notice.
They're also ready to drop that at a moment's notice in case this really is a prelude to another war.