FALLING
break someone's fall
to cushion a falling person; to lessen the impact of a falling person.When the little boy fell out of the window, the bushes broke his fall.The old lady slipped on the ice, but a snow bank broke her fall.
fall head over heels
to fall down, perhaps turning over or rolling.Fred tripped on the rug and fell head over heels into the center of the room.Slow down or you will fall down—head over heels.
keel over
[for a person] to fall over or fall down in a faint or in death.Suddenly, Mr. Franklin keeled over. He had had a heart attack.It was so hot in the room that two people just keeled over.