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.
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.