pick at

Verb	1.	pick at - pluck or pull at with the fingers; "She picked nervously at the buttons of her blouse" Synonyms: pluck at, pull at
	2.	pick at - eat like a bird; "The anorexic girl just picks at her food" Synonyms: peck at, peck
	3.	pick at - express a negative opinion of; "She disparaged her student's efforts" Synonyms: disparage, belittle

pluck at, pull, pull at