Synonym of WHITTLE

Decrease : make or become smaller or fewer in size, amount, intensity, or degree.
Avoid : keep away from or stop oneself from doing (something).
Renounce : formally declare one's abandonment of (a claim, right, or possession).
Conceal : not allow to be seen; hide.
Whittle : reduce something in size, amount, or extent by a gradual series of steps.

Synonym of Whittle is Decrease