A small nail with a flat head; or a course of action or direction; or in sailing, a change of direction.
From Old French 'tache' meaning 'clasp' or 'button,' or possibly from Old English. Has multiple meanings that evolved separately.
In sailing, 'tacking' is the technique of zigzagging against the wind—sailors literally can't sail directly into the wind, so they discovered this angled approach centuries ago, making 'tack' a genius word for problem-solving!
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