bobby pin

Từ điển Oxford Advanced Learner 8th

ˈbobby pin BrE NAmE (NAmE) (BrE hair·grip, grip, kirby grip) noun
a small thin piece of metal or plastic folded in the middle, used by women for holding their hair in place
compare ↑hairpin
See also: ↑grip ▪ ↑hairgrip ▪ ↑kirby grip

Word Origin:
[bobby pin] 1930s: from ↑bob ‘the hairstyle’ (because bobby pins were originally used with bobbed hair) + ↑-y.