A Drag

1. (uncountable) Resistance of the air (or some other fluid) to something moving through it.
2. (countable, foundry) The bottom part of a sand casting mold.
3. (countable) A device dragged along the bottom of a body of water in search of something, e.g. a dead body, or in fishing.
4. (countable, informal) A puff on a cigarette or joint.
5. (countable, slang) Someone or something that is annoying or frustrating, or disappointing; an obstacle to progress or enjoyment.
6. (countable, slang) A type of horse-drawn carriage. [from mid-18th c.]
7. (countable, slang) Street, as in 'main drag'. [from mid-19th c.]
8. (countable) The scent-path left by dragging a fox, for training hounds to follow scents.
9. (countable, snooker) A large amount of backspin on the cue ball, causing the cue ball to slow down.
10. A heavy harrow for breaking up ground.
11. A kind of sledge for conveying heavy objects; also, a kind of low car or handcart.
12. (metallurgy) The bottom part of a flask or mould, the upper part being the cope.
13. (masonry) A steel instrument for completing the dressing of soft stone.
14. (nautical) The difference between the speed of a screw steamer under sail and that of the screw when the ship outruns the screw; or between the propulsive effects of the different floats of a paddle wheel.
15. Anything towed in the water to retard a ship's progress, or to keep her head up to the wind; especially, a canvas bag with a hooped mouth (drag sail), so used.
16. A skid or shoe for retarding the motion of a carriage wheel.
17. Motion affected with slowness and difficulty, as if clogged.
18. witch house music
19. The last position in a line of hikers.
20. (aviation, aerodynamics) The act of suppressing wind flow to slow an aircraft in flight, as by use of flaps when landing.
21. (historical) A mailcoach.