1.
If something falls away from the thing it is attached to, it breaks off.
Officials say that one or two engines fell away from the plane shortly after takeoff.
PHRASAL VERB: V P from n, also V P
2.
If you say that land falls away, you mean it slopes downwards from a particular point.
On either side of the tracks the ground fell away sharply.
PHRASAL VERB: V P
3.
If the degree, amount, or size of something falls away, it decreases.
His coalition may hold a clear majority but this could quickly ~...
= fall off
PHRASAL VERB: V P