Definition of tack:

part of speech: verb

To attach or fasten slightly; to change the course of a ship by shifting the tacks and position of the sails.

part of speech: noun

A very small nail with a flat head- so called from being used to fasten something on or to another, as a carpet on a floor; the course of a ship with reference to the position of the sails; the rope which fastens the foremost corner of the sail to the windward side of a ship, which is said to tack in going against a wind when the tack is changed from one side to the other; in Scot., a lease of land, & c.

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