(1)段階的な方法で
(2)in a gradual manner; "the snake moved gradually toward its victim"
さらに詳しく
(1)帆の前面に対して風を受けること
(2)不意に
(3)having the wind against the forward side of the sails; "the ship came up into the wind with all yards aback"
(4)by surprise; "taken aback by the caustic remarks"