pick at

US /pɪk æt/
UK /pɪk æt/
"pick at" picture
1.

少しずつ食べる, 食欲なく食べる

eat food slowly and without much enthusiasm

:
She was so upset that she could only pick at her dinner.
彼女はとても動揺していたので、夕食を少ししか食べられなかった
He's been picking at his food all evening.
彼は一晩中、食べ物を少しずつしか食べていない
2.

つつく, あら探しをする

criticize someone or something repeatedly, especially in a petty or annoying way

:
She's always picking at his grammar.
彼女はいつも彼の文法をつついている
Don't pick at every little mistake I make.
私の些細な間違いをいちいちつつかないで