a flat, springlike metal hairpin having the prongs held close together by tension.
Origin of bobby pin
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
US, Canadian, Australian and NZ a metal hairpin bent in order to hold the hair in placeBrit terms: hairgrip, kirby grip
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Online Etymology Dictionary, © 2010 Douglas Harper