fall down
phr. v..phr. v.. to drop to the ground by accident, usually because you tripped or lost your balance.
phr. v.. to drop to the ground from an upright position; intransitive phrasal verb often used to describe accidental loss of balance or the collapse of a structure.
Be careful on the ice or you will fall down.
The toddler tried to walk across the room but tripped on a toy and fell down.
The old wooden shed finally fell down after years of neglect and exposure to the harsh winter storms.
usually used without an object to describe the action of falling to the floor.
contrast with 'fall over' (often used for objects or people tipping from a vertical to horizontal position) and 'fall off' (moving from a higher surface to a lower one).
He fell down the chair.He fell off the chair.use 'fall down' for dropping to the ground; use 'fall off' when moving from a surface like a chair or bike to the floor.