1 [countable usually singular]
a limit or level at which you stop doing something [↪ deadline]
cut-off date/point/score etc (=the date etc when you stop doing something)
The cut-off date for registration is July 2.
2 [countable usually singular]
when you completely stop doing something or supplying something
A full-scale cut-off of US aid would be a disaster.
3 or cut-off jeans/trousers etc [plural]DCC
short trousers that you make by cutting off the bottom part of a pair of trousers