big end

noun Machinery.
the end of a connecting rod or piston rod that is attached to a crankpin.

1905–10 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
big end
1.  Compare little end Also called (in vertical engines): bottom end the larger end of a connecting rod in an internal-combustion engine
2.  the bearing surface between the larger end of a connecting rod and the crankpin of the crankshaft

Collins English Dictionary - Complete & Unabridged 10th Edition
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