"To drop an object" means to accidentally let go of or release something, causing it to fall down.
Sentences with «to drop an object»
They open and close doors, retrieve dropped objects, and turn on and off lights. (dailypuppy.com)
Many people with disabilities are even training their own assistance dogs to help with household tasks; opening doors and picking up dropped objects on cue. (capitoltrainingandbehavior.com)
Your baby will also purposely drop objects for someone, probably you, to pick up. (babycenter.com)