mainsheet [
'meinʃi:t]
n. 主帆帆脚索
mainsheet[ noun ]
(nautical) a line (rope or chain) that regulates the angle at which a sail is set in relation to the wind
<noun.artifact>
mainsheet \main"sheet`\, n. (Naut.)
One of the ropes by which the mainsail is hauled aft and
trimmed.