In the United States, Welcome means welcome guest. In England, Welcome means welcomed.
It means one has stayed longer than they were welcomed to stay, implies that a visitor has stayed longer than is considered good etiquette.
a⋅vow. /əˈvaʊ/ Show Spelled Pronunciation [uh-vou] Show IPA-verb (used with object) to declare frankly or openly; own; acknowledge; confess; admit: He avowed himself an opponent of all...
it means that you are welcome.
You are welcome.