A Rush

1. A sudden forward motion.
2. A surge.
3. General haste.
4. A rapid, noisy flow.
5. (military) A sudden attack; an onslaught.
6. (video games) The strategy of attacking an opponent with a large swarm of weak units, rather than spending time developing their abilities. Synonym: zerg
7. (contact sports) The act of running at another player to block or disrupt play.
8. (American football, dated) A rusher; a lineman.
9. A sudden, brief exhilaration, for instance the pleasurable sensation produced by a stimulant.
10. (US, figuratively) A regulated period of recruitment in fraternities and sororities.
11. (US, dated, college slang) A perfect recitation.
12. (croquet) A roquet in which the object ball is sent to a particular location on the lawn