1.
If you ~ on something or ~ something, you use or do less of it.
He ~ on coffee and cigarettes, and ate a balanced diet...
Car owners were asked to ~ travel...
If you spend more than your income, can you try to ~?
PHRASAL VERB: V P on n, V P n (not pron), V P, also V n P
2.
If you ~ a tree, you cut through its trunk so that it falls to the ground.
A vandal with a chainsaw ~ a tree.
= chop down
PHRASAL VERB: V P n (not pron), also V n P