English Dictionary
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to fix something somewhere with a small nail
The wooden strips have to be tacked down.
to pin something such as a piece of paper on a wall or board etc
She tacked up the photograph on the bulletin board.
to stitch pieces of cloth together with long loose stitches, usually before you stitch the cloth more carefully
if a boat tacks, it turns so that the wind is blowing on the other side of its sails