One by one, the skydivers dropped out of the plane.
•The marshmallows dropped out of the bag.
2. Lit. or Fig. [for the bottom of something] to break loose and drop. •The bottom dropped out of the box, spilling everything everywhere.
•The bottom dropped out of the stock market, and we lost a lot of money.
3. Fig. [for someone] to resign from or cease being a member of something; [for someone] to leave school. •Sally dropped out of school for some unknown reason.
•But why did she drop out?