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English definition of “pin”

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pin

noun [C] uk   /pɪn/ us  

pin noun [C] (METAL STICK)

B1 a small thin piece of metal with a point at one end, especially used for temporarily holding pieces of cloth together: I'll keep the trouser patch in place with pins while I sew it on. a thin piece of metal: If you pull the pin out of a hand-grenade, it'll explode. Is it a two-pin plug or a three-pin plug? Doctors inserted a metal pin in his leg to hold the bones together. a decorative object, used as jewellery: a hat/tie pin US a brooch
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pin noun [C] (LEG)

[usually plural] old-fashioned humorous a leg: Grandpa's very old now and he's a bit shaky on his pins.

pin noun [C] (IN CHESS)

specialized games In the game of chess, a pin is a special move that stops the other player from moving one of their pieces, because to move it will put another more valuable piece in danger: That nasty pin stopped me from moving my knight.

pin

verb uk   /pɪn/ (-nn-) us  

pin verb (METAL STICK)

B1 [T + adv/prep] to fasten something with a pin: A large picture of the president was pinned to/(up) on the office wall. She had pinned up her beautiful long hair. [T] US old-fashioned When a young man pins a young woman, he gives her a piece of jewellery to show that they love each other.
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pin verb (STOP MOVEMENT)

[T + adv/prep] to force someone or something to stay in a particular place by putting weight on him, her, or it: She was pinned (down) under a pile of rubble. A guy leaped out at me and pinned me (up) against the wall.
(Definition of pin noun, verb from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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