up until. The Columbia Guide to Standard American English. 1993

Kenneth G. Wilson (1923–). The Columbia Guide to Standard American English. 1993.

up until


is a compound preposition that means the same as until, as in We can stay until [up until] Thursday. Limit it to Conversational and Informal and Semiformal use, and let context make clear the relation (if any) to bedtime; until by itself is more appropriate in most Edited English.	1