Y'all know he harmless. He just down on his luck.

你们知道他不会伤人的，他只是不走运。

He must be down on his luck.

那他真是太衰了。

If he's down on his luck, it means he hasn't had any good luck recently; things are not going well for him.

如果他运气不好，说明他最近没有什么好运气； 事情对他来说并不顺利。