What does 2 Kings 21:16 mean?

Manasseh killed so many innocent people in Jerusalem that the city was filled with blood from one end to the other. On top of that, he led Judah into sin by encouraging them to worship idols. 2 Kings 21:16 - Modern Text Bible

(Manasseh’s violence and idolatry are both highlighted. He’s guilty of both murder and spiritual corruption.)