/pɪn ||; pɪn/noun[C] 1 a short thin piece of metal with a round head at one end and a sharp point at the other. Pins are used for fastening together pieces of cloth, paper, etc. 大头针
2 a thin piece of wood or metal that is used for a particular purpose 夹子: a hairpin 发夹a two-pin plug 两脚插头 ☞picture at plug 见plug插图