mainsheet

[ meyn-sheet ]
/ ˈmeɪnˌʃit /

noun Nautical.

a sheet of a mainsail.

Origin of mainsheet

First recorded in 1475–85; see origin at main1, sheet1
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British Dictionary definitions for mainsheet

mainsheet
/ (ˈmeɪnˌʃiːt) /

noun

nautical the line used to control the angle of the mainsail to the wind
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012