a person who cannot provide for himself and is a burden to those who have to feed and keep him
extra mouth to feed.
И без того обездоленная слухами о своём классовом происхождении, совесть его окончательно замолкла и в распрях его страстей уже не принимала никакого участия, как бедная родственница, лишний рот, незаметно устраивалась где-нибудь в уголке, чтобы не слишком попадаться на глаза... (Искандер 3). His conscience, which had already been harassed and impoverished anyway by rumors about its class origin, was silenced for good and took no sides in the feuding among his passions-I ike a poor female relative, an extra mouth to feed, who fixes herself up in some out-of-the-way corner lest she invite too much attention... (3a).