Difficulty      
masticate
To poke; to instigate; to stir up.
To degrade; to lessen or decline in purity; to reduce the quality of.
To make a small sound; to rub two objects together to make a sound, as for example two pieces of silk; to make a sounds while brushing against something.
To chew; to grind in one's mouth.
To cut away the outer covering or layer; to remove the skin of; to trim using a knife.

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