開關

开关
kāiguān
  1. power switch
  2. gas valve
  3. to open the city (or frontier) gate
  4. to open and close
  5. to switch on and off

CEDICT

Entry Composition

1 開 kāi
  1. to open (transitive or intransitive)
  2. (of ships, vehicles, troops etc) to start
  3. to turn on; to put in operation; to operate; to run
  4. to boil
  5. to write out (a prescription, check, invoice etc)
  6. (directional complement) away; off
  7. carat (gold)
  8. abbr. for Kelvin, 開爾文 Kāiěrwén
  9. abbr. for 開本 kāiběn, book format
2 關 guān
  1. mountain pass
  2. to close; to shut; to turn off
  3. to confine; to lock (sb) up; to shut (sb in a room, a bird in a cage etc)
  4. to concern; to involve