(historical) A kind of tape made from, or incorporating, cotton "duck" fabric. / (trademark, also used generically) A type of multi-purpose heavy-duty adhesive tape.

A generally gray waterproof adhesive tape used for many purposes and easy to cut with the hands.

(transitive) To use duct tape in order to tape one object to another.

A small atmospheric vortex appearing in clear, dry conditions, made visible by swirling dust picked up from the ground.

(music) A musical composition in two parts, each performed by a single voice (singer, instrument or univoce ensemble). / (music) A song composed for and/or performed by a duo.

(intransitive) To perform a duet. / (intransitive, zoology, of pairs of animals) To communicate (warnings, mating calls, etc.) through song. / (transitive) To perform (sing, play, etc.) as a duet.

Of or pertaining to a duke, a duchess, or the duchy or dukedom they hold.

Ruler or monarch of a grand duchy. / Son or grandson of a czar (emperor) of the Russian Empire. (A more literal translation of the Russian would be grand prince.)

(chiefly US, Canada, colloquial) A man, generally a younger man. / (colloquial, used in the vocative) A term of address for someone, typically a man, particularly when cautioning them or offering advice.

(slang) A term of address, usually for a man, conveying awe, excitement, surprise, annoyance, etc.