His advantage turned against him.是什么意思？

His advantage turned against him.

他的优势后来成了他的不利条件。

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。

advantage

n. 有利条件，益处，优越（性），处于支配地位；vt. 有利于，有益于，促进，使处于有利地位；vi. 得益，获利；

例句
They are deliberately flouting the law in order to obtain an advantage over their competitors...
他们为了和竞争对手抢夺先机而公然无视法律。

turned

v. （使）转动( turn的过去式和过去分词 )，旋转，（使）改变方向，（使）不适；

例句
With one accord they turned and walked back over the grass.
他们步调一致地转身走过草坪。

against

prep. 反对，对…不利，紧靠，以防；

例句
His hand brushed against hers; it could have been either accidental or deliberate.
就在有意无意间，他的手轻轻拂过她的手。

him

pron. (he的宾格)他；

例句
They said goodbye to him as he got aboard the train at Union Station.
当他在联合火车站登上火车之际，他们向他道别。