不用

need not

no; not so / (bound form) not; un-

to use / to employ / to have to / to eat or drink / expense or outlay / usefulness / hence / therefore

needless to say / it goes without saying

needless to say; it goes without saying

You're welcome / Don't mention it

you're welcome / don't mention it / no need to stand on ceremony

have sth ready just in case / keep sth for possible future use

committing all manner of crimes / completely unscrupulous

"keep the change" (restaurant expression)