つめをかむくせ
habit of biting one's nails
Expression
彼女かのじょは爪つめを噛かむ癖くせがある。
She has a habit of biting her nails.
トムは爪つめを噛かむ癖くせがある。
Tom has the habit of biting his nails.
彼かれは爪つめを噛かむ癖くせをやっと直なおした。
He managed to cure himself of his habit of nibbling his nails.