really must go

I really must go

I truly have to depart. Used especially when one's intention to leave has already been stated. Thank you for the drink, but I really must go now. I'd love to stay longer, but I really must go now.
See also: go, must, really
Farlex Dictionary of Idioms.

(I) really must go.

an expression announcing or repeating one's intention to depart. Bob: It's getting late. I really must go. Jane: Good night, then. See you tomorrow. Sally: I really must go. John: Do you really have to? It's early yet.
See also: go, must, really
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • depart
  • depart for (some place)
  • depart for some place
  • go away
  • Go away!
  • going away
  • (it's) time to push off
  • depart this life
  • (one) has got to push off
  • (one) has to push off