Definition of safety pin noun from the Oxford Advanced Learner's Dictionary

 

safety pin

 noun
noun
BrE
 
; NAmE
 
 
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a pin with a point bent back towards the head, that is covered when closed so that it cannot hurt you Can I borrow a safety pin? My button’s come off and I need something to hold my shirt closed. Fasten the baby’s nappy with a safety pin.
See the Oxford Advanced American Dictionary entry: safety pin