Doormat (noun)

1. A mat placed at a doorway for wiping dirt from shoes before entering a building.
2. A person who is submissive and allows others to treat them badly.

Origin:

From "door" + "mat", a mat laid outside or inside a door for people to wipe their feet on.

Examples:

1. I wiped my feet on the doormat before entering the house.
2. I felt like a doormat in that relationship.