luffing
上下擺動; 起重機臂轉向
Luff v. i. [imp. & p. p. Luffed p. pr. & vb. n. Luffing.]
1. Naut. To turn the head of a vessel toward the wind; to sail nearer the wind; to turn the tiller so as to make the vessel sail nearer the wind.
To luff round, or To luff alee, to make the extreme of this movement, for the purpose of throwing the ship's head into the wind.
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