be only visited by green bottle flies after death—a person who has no friends in his lifetime will have no mourners after death
青蠅吊客qīnɡ yínɡ diào kè
青蠅：指蒼蠅；吊：憑吊。比喻生前沒(méi)有什么知己，死后只有蒼蠅來(lái)吊唁。nobody else attended sb.’s funeral, a lone person who has not had a single friend during his or her lifetime