1
general::
Phrase(s): Take it or leave it.
Inf. Take this one or none; you have no choice. • Bill: That’s my final offer. Take it or leave it. Bob: Aw, come on! Take off a few bucks. • Bill: Aw, I want eggs for breakfast, Mom. Mother: There’s only cornf lakes left. Take it or leave it.
McGrawhill's American Idioms And Phrasal Verbs
2
general::
Accept or reject unconditionally, as in I'm asking $1,000 for this computer? take it or leave it. This term, used to indicate one's final offer, was first recorded in 1576.
American Heritage Idioms