Nibble
WordNet
noun
(1) Gentle biting
(2) A small byte
verb
(3) Eat intermittently; take small bites of
"He pieced at the sandwich all morning"
"She never eats a full meal--she just nibbles"
(4) Bite gently
"The woman tenderly nibbled at her baby's ear"
(5) Bite off very small pieces
"She nibbled on her cracker"