The Oxford Thesaurus An A-Z Dictionary of Synonyms - pin n.

1) peg, dowel, bolt, thole, thole-pin, spike, rivet; Brit drawing-pin, US push-pin: The table is held together by wooden pins. We need some more pins for the notice-board. 2) brooch, clip; stickpin, tie-pin, scarf-pin, US tie tack: She is wearing the cameo pin that her mother gave her. I had George's pin made into a brooch. --v. 3) attach, fix, affix, fasten, secure, tack; hold, staple, clip: Let's play 'Pin the tail on the donkey'. Pin these papers together. 4) pin down. a force, make, compel, coerce, constrain, press, Brit pressurize, US pressure: We must pin him down to give his decision by tomorrow. b define, specify, pinpoint, name, identify, determine, name, put or lay one's finger on, home or zero in on, focus on: The doctor was unable to pin down what is wrong with her. c confine, hold (down) , fix, immobilize, tie down, constrain: We were pinned down by enemy fire. 5) pin on. blame, hold responsible or accountable, point the finger at, accuse; lay at (someone's) door: They'll never be able to pin the murder on Drayton.