A Stop

1. A (usually marked) place where buses, trams or trains halt to let passengers get on and off, usually smaller than a station. Related terms: halt, station.
2. An action of stopping; interruption of travel.
3. That which stops, impedes, or obstructs; an obstacle; an impediment.
4. A device intended to block the path of a moving object

1. 1. (engineering) A device, or piece, as a pin, block, pawl, etc., for arresting or limiting motion, or for determining the position to which another part shall be brought.
   2. (architecture) A member, plain or moulded, formed of a separate piece and fixed to a jamb, against which a door or window shuts.
2. (linguistics) A consonant sound in which the passage of air through the mouth is temporarily blocked by the lips, tongue, or glottis. Synonyms: plosive, occlusive
3. A symbol used for purposes of punctuation and representing a pause or separating clauses, particularly a full stop, comma, colon or semicolon.
4. (music) A knob or pin used to regulate the flow of air in an organ.
5. (music) 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.
6. (tennis) A very short shot which touches the ground close behind the net and is intended to bounce as little as possible.
7. (soccer) A save; preventing the opposition from scoring a goal
8. (zoology) The depression in a dog’s face between the skull and the nasal bones.
9. (photography) A part of a photographic system that reduces the amount of light.
10. (photography) A unit of exposure corresponding to a doubling of the brightness of an image.
11. (photography) An f-stop.
12. The diaphragm used in optical instruments to cut off the marginal portions of a beam of light passing through lenses.
13. (fencing) A coup d'arret, or stop thrust.