don't make me say it again
You better listen because I am not going to repeat myself. This phrase usually conveys the speaker's anger or frustration. You better take this trash out right now—don't make me say it again!
Don't make me say it again!
and Don't make me tell you again!I have told you once, and now I'm mad, and I'll be madder if I have to tell you again. (*Typically said to a child who will not obey.) Mother: I told you thirty minutes ago to clean up this room! Don't make me tell you again!