Definition of pin:
a small device, made (usually) of drawn-out steel wire with one end sharpened and the other flatten
ed or rounded into a head, used for fasten
ing; a small nail
with a head
and a sharp point
"I'm not so good on my pins these days"
(often followed by a preposition such as to or on) To fasten or attach (something) with a pin; (chess; usually in the passive
) To cause (a piece) to be in a pin
"...you can't pin that robbery on me!-->"