stop

1. A (usually marked) place where buses, trams or trains halt to let passengers get on and off, usually smaller than a station.

   They agreed to meet at the bus stop.

2. An action of stopping; interruption of travel.

   That stop was not planned.

3. That which stops, impedes, or obstructs; an obstacle; an impediment.
4. A device intended to block the path of a moving object

   door stop

5. A consonant sound in which the passage of air through the mouth is temporarily blocked by the lips, tongue, or glottis.
6. A symbol used for purposes of punctuation and representing a pause or separating clauses, particularly a full stop, comma, colon or semicolon.
7. A knob or pin used to regulate the flow of air in an organ.

   The organ is loudest when all the stops are pulled.

8. One of the vent-holes in a wind instrument, or the place on the wire of a stringed instrument, by the stopping or pressing of which certain notes are produced.
9. A very short shot which touches the ground close behind the net and is intended to bounce as little as possible.
10. The depression in a dog’s face between the skull and the nasal bones.

    The stop in a bulldog's face is very marked.

11. A part of a photographic system that reduces the amount of light.
12. A unit of exposure corresponding to a doubling of the brightness of an image.
13. An f-stop.
14. The diaphragm used in optical instruments to cut off the marginal portions of a beam of light passing through lenses.
15. A coup d'arret, or stop thrust.

1. To cease moving.

   I stopped at the traffic lights.

2. To not continue.

   Soon the rain will stop.

3. To cause (something) to cease moving or progressing.

   The sight of the armed men stopped him in his tracks.

4. To cease; to no longer continue (doing something).

   One of the wrestlers suddenly stopped fighting.

5. To cause (something) to come to an end.

   The referees stopped the fight.

6. To close or block an opening.

   He stopped the wound with gauze.

7. (often with "up" or "down") To adjust the aperture of a camera lens.

   To achieve maximum depth of field, he stopped down to an f-stop of 22.

8. To stay; to spend a short time; to reside or tarry temporarily.

   He stopped at his friend's house before continuing with his drive.

9. To regulate the sounds of (musical strings, etc.) by pressing them against the fingerboard with the finger, or otherwise shortening the vibrating part.
10. To punctuate.
11. To make fast; to stopper.

noun

A small well-bucket; a milk-pail.

adjective

Being or relating to the squark that is the superpartner of a top quark.