Duck – a waterbird with a broad blunt bill, short legs, webbed feet, and a waddling gait; a quick lowering of the head or body; strong untwilled linen or cotton fabric, used chiefly for casual or work clothes and sails; to lower the head or the body quickly to avoid a blow or so as not to be seen; to avoid.

Duck fabric can, of course, be repaired with duck tape. For some reason people here seem to think that it is “duct” tape.
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