noun
hairpin; bobby pin
A small clip or pin used to hold hair in place. Often refers to the flat, spring-loaded type (bobby pin) as well as U-shaped hairpins.
See also: ヘアピン
前髪をピン留めでとめる。
I hold my bangs back with a bobby pin.
ピン留めが外れて髪が落ちてきた。
The hairpin came loose and my hair fell down.