at a moment's notice

(redirected from on a moment's 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

at a moment's notice

almost immediately Everyone was packed and ready to leave at a moment's notice.
Related vocabulary: at the drop of a hat
See also: notice