The Collaborative International Dictionary
Jeer capstan
Jeer \Jeer\, n. [Cf. Gear.] (Naut.)
A gear; a tackle.
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pl. An assemblage or combination of tackles, for hoisting or lowering the lower yards of a ship.
Jeer capstan (Naut.), an extra capstan usually placed between the foremast and mainmast.
Wiktionary
jeer capstan
n. (context nautical English) An extra capstan usually placed between the foremast and mainmast.