mainsail

noun

USMAYN-sayl/ˈmeɪnseɪl/

Pluralmainsails

1 meaning of mainsail

1
nouncountable
The biggest sail on a boat, usually the main one that catches the wind.
Like the main engine that does most of the work to move something forward.
We raised the mainsail as soon as we left the harbor.
A sudden gust filled the mainsail and pushed the boat forward.
Note

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Origin

This word comes from 'main' plus 'sail'.