One of the mysteries of the English language finally explained.
A point in the cycle of a reciprocating engine, compressor, etc., when a piston is nearest the crankshaft and the corresponding crank is in line with its connecting rod; the position of the crank or piston at this point; (also) the point in pedalling a bicycle when one of the pedals is in the lowest position.
Late 19th century; earliest use found in Henry Evers (fl. 1850–1887).
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