Snip off
Definition 1 of 2
Pro Tip 1/3Physical Action
Implies using hands and a tool to make a precise cut. 
He snipped off the corner of the paper to shape it.
Pro Tip 2/3Slight Alteration
Often suggests a small, subtle change, not a major one. 
She snipped off a bit of ribbon for the gift.
Pro Tip 3/3Precision Required
Use when careful or meticulous cutting is needed. 
The tailor carefully snipped off the excess thread.