hinge
noun [ C ] uk/hɪndʒ/ us/hɪndʒ/
合页，铰链
a piece of metal that fastens the edge of a door, window, lid, etc. to something else and allows it to open or close
We had to take the front door off its hinges to get our new sofa into the house. 我们不得不把前门从合页上卸下来才把新沙发搬进了屋子里。