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gib and key
From The Collaborative International Dictionary of English v.0.48:
Gib \Gib\, n. [Etymol. uncertain.] A piece or slip of metal or wood, notched or otherwise, in a machine or structure, to hold other parts in place or bind them together, or to afford a bearing surface; -- usually held or adjusted by means of a wedge, key, or screw. [1913 Webster] Gib and key, or Gib and cotter (Steam Engine), the fixed wedge or gib, and the driving wedge,key, or cotter, used for tightening the strap which holds the brasses at the end of a connecting rod. [1913 Webster]