keep behind

keep behind

v.
1. To hold or maintain someone or something to the rear of something else: I keep my car behind the garage.
2. To remain to the rear of something: We didn't want them to see us, so we kept behind the barn when they arrived.
3. To fail to advance someone to the next grade or class of school; flunk. Usually used in the passive: After a year of doing poorly in class, the troubled student was kept behind.
See also: behind, keep