doormat
 oxford
 views  updated May 14 2018door·mat  / ˈdôrˌmat/ •
n. a mat placed in a doorway, on which people can wipe their shoes on entering a building. ∎ fig.  a submissive person who allows others to dominate them: to put up with such treatment you must be either a saint or a doormat.
 The Oxford Pocket Dictionary of Current English