noun:

1. The line from behind and over which the cue ball must be played after being out of play, as by being pocketed or knocked off the table; also called the string line.
2. Such a structure considered as a substance.
3. The main object of study in string theory, a branch of theoretical physics.
4. Part of the game of billiards, where the order of the play is determined by testing who can get a ball closest to the bottom rail by shooting it onto the end rail.
5. A series of items or events.
6. A nerve or tendon of an animal body.
7. A length of wire or other material used as vibrating element on a musical instrument.
8. (countable) Any similar long, thin and flexible object.
9. The tough fibrous substance that unites the valves of the pericarp of leguminous plants.
10. A fibre, as of a plant; a little fibrous root.
11. A length of nylon or other material on the head of a racquet.
12. A cohesive substance taking the form of a string.
13. A small, filamentous ramification of a metallic vein.
14. A drove of horses, or a group of racehorses kept by one owner or at one stable.
15. A strip, as of leather, by which the covers of a book are held together.
16. A thread or cord on which a number of objects or parts are strung or arranged in close and orderly succession; hence, a line or series of things arranged on a thread, or as if so arranged.
17. The buttons strung on a wire by which the score is kept.
18. Cannabis or marijuana.
19. In various games and competitions, a certain number of turns at play, of rounds, etc.
20. An ordered sequence of text characters stored consecutively in memory and capable of being processed as a single entity.
21. The members of a sports team or squad regarded as most likely to achieve success. (Perhaps metaphorical as the "strings" that hold the squad together.) Often first string, second string etc.
22. The points made in a game of billiards.
23. A stringed instrument.
24. An inside range of ceiling planks, corresponding to the sheer strake on the outside and bolted to it.
25. A hoax; a fake story.
26. The stringed instruments as a section of an orchestra, especially those played by a bow, or the persons playing those instruments.
27. Synonym of stable (“group of prostitutes managed by one pimp").
28. A long, thin and flexible structure made from threads twisted together.
29. A stringcourse.
30. The conditions and limitations in a contract collectively.

verb:

1. To drive the ball against the end of the table and back, in order to determine which player is to open the game.
2. To deliberately state that a certain bird is present when it is not; to knowingly mislead other birders about the occurrence of a bird, especially a rarity; to misidentify a common bird as a rare species.
3. To put (items) on a string.
4. To put strings on (something).
5. To form into a string or strings, as a substance which is stretched, or people who are moving along, etc.