In sailing, to ease means to gradually let out a line—most commonly a sheet—to reduce tension on the sail, allowing it to move further away from the centerline. It is the opposite of "trimming" (pulling in) and is used to control sail shape, reduce power in heavy wind, or adjust for changing direction.

Key Aspects of Easing:
Ease the Sheets: Letting out the sail lines (main sheet or jib sheet) when sailing downwind or in strong wind to reduce pressure.

"Ease Her": A command to relieve pressure on the sails, usually by luffing (turning towards the wind).

Purpose: To prevent the boat from tipping too much (excessive heel) and to optimize sail performance.

Essentially, if the boat is overpowered, you "ease" the sails to make them less effective, thus stabilizing the boat.