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