1.
If you hold something over someone, you use it in order to threaten them or make them do what you want.
Did Laurie know something, and hold it over Felicity?
PHRASAL VERB: V n P n
2.
If something is held over, it does not happen or it is not dealt with until a future date.
Further voting might be held over until tomorrow...
We would have held the story over until the next day.
PHRASAL VERB: be V-ed P, V n P, also V P n (not pron)