a thin metal stick with a point at one end, esp. used for temporarily holding pieces of cloth together or used generally for holding things together.
a thin piece of stiff wire with a pointed end that you can stick through two things to fasten them together
I'll keep the patch in place with pins while I sew it on.
A pin can also be decorative and used as jewellery.
Mary put a pin in her hair to hold her hat on.
She wore a beautiful gold pin on her coat.
Pins and needles is an uncomfortable feeling of being stuck by a lot of sharp points, which may happen when you have not moved an arm or a leg for a long time or have kept it pressed against something.
If someone is on pins and needles, they are worried or anxious about something that is going to happen:
Don't keep Margaret on pins and needles, give her a call.
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