Etymology
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bobby pin (n.)

1928, from diminutive of bob (n.2) + pin (n.).

updated on December 12, 2012

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Definitions of bobby pin from WordNet

bobby pin (n.)
a flat wire hairpin whose prongs press tightly together; used to hold bobbed hair in place;
in Britain they call a bobby pin a grip
Synonyms: hairgrip / grip
From wordnet.princeton.edu, not affiliated with etymonline.