投

tóu
  1. to throw (sth in a specific direction: ball, javelin, grenade etc)
  2. to cast (a ballot)
  3. to cast (a glance, a shadow etc)
  4. to put in (money for investment, a coin to operate a slot machine)
  5. to send (a letter, a manuscript etc)
  6. to throw oneself into (a river, a well etc to commit suicide)
  7. to go to; to seek refuge; to place oneself into the hands of
  8. (coll.) to rinse (clothes) in water

CEDICT

colloquial