Mainsail is used specifically in sailing and nautical contexts.

Sailing Context

Used with verbs like hoist, lower, and trim related to sail handling.

Action Verbs

Refers to the main sail on both small boats and large ships.

Boat Size

 And they find us quite a novelty, so they literally windsurf off the wind that comes off the mainsail and they hang behind the boat, and you feel this presence behind you, and you turn around, and it's this albatross just looking at you. We sold Maiden at the end of the race -- we still had no money.