We use this expression to talk about something that might be necessary in the future.
You can use this phrase in ………… language.
A: Have you finished your speech for the AGM tomorrow?
B: No, but I’ll work on it all night, if needs be.
A: Are we going to have enough people in the shop for the Christmas sales?
B: I think so, but if needs be, we can always get some students to help us…