house-sitter       
noun [ C ] uk/ˈhaʊsˌsɪt.ər/ us/ˈhaʊsˌsɪt̬.ɚ/
 (房主不在时)替人照看房子的人
a person who stays in someone's house while they are away in order to keep it safe
  A house-sitter is mainly there to provide security. 房主不在时替人照看房子的人主要职责是保证房屋安全。 
 If you will be away, I know two great house-sitters needing a place to stay. 如果你要外出的话,我认识两个很适合帮你照看房子的人,他们也正好需要一个住处。 
 See: house-sit
 - More examples
 - Many people find renting their house out is more sensible financially than employing a house-sitter.
 - We leave a robot house-sitter behind when we go on trips, and check in over the internet to see what's going on.
 - No one realized the couple were missing until their house-sitter became worried when they were overdue returning home.