leave flat Idiom, Proverb
leave flat
leave flat Forsake or abandon completely, especially without warning. For example,
He didn't tell her he wasn't picking her up; he just left her flat. [Colloquial; c. 1900] Also see
high and dry;
leave in the lurch.
leave flat|flat|leave
v. phr.,
informal To quit or leave suddenly without warning when wanted or needed; desert; forsake; abandon.
Sam found that being a member of the trail-clearing group was a lot of hard work, so he left them flat. My car ran out of gas and left me flat, ten miles from town. Compare: LEAVE IN THE LURCH, WALK OUT
2.