tack noun definition in Travelling by boat or ship topic from the Oxford Advanced Learner's Dictionary

tack

 noun: Travelling by boat or ship topic
[countable, uncountable] (specialist) the direction that a boat with sails takes as it sails at an angle to the wind in order to fill its sails They were sailing on (a) port/starboard tack(= with the wind coming from the left/right side).

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