He's always slagging his brother off.是什么意思？

He's always slagging his brother off.

他老损他的弟弟.

always

adv. 总是，老是，永远，始终，常常，不断地；

例句
Some cities are always going to be more advantaged.
一些城市总会有一些得天独厚的优势。

slagging

v. 造渣，（使）成渣（状）( slag的现在分词 )，诋毁，贬损，辱骂；

例句
People have been slagging me off.
人们一直在贬损我。

his

pron. (he的所有格)他的，(he的物主代词)他的东西；det. 属于他的，用于名词前，自己的，指某人的，上帝的；

例句
He claimed that his parents had abandoned him...
他声称父母遗弃了他。

brother

n. 兄弟，同事，同胞，同志；int. （表示生气或吃惊）我的老兄！；

例句
Julian Lloyd Webber thinks his brother would like the approbation of serious critics...
朱利安·劳埃德·韦伯认为他弟弟希望获得严肃批评家的认可。

off

prep. 从…落下，离开，从…去掉，下班；adv. 离开，距，离，被取消，下班；adj. 不新鲜的，不能接受，不礼

例句
He eased his foot off the accelerator.
他松开了油门。