His glasses had slipped...是什么意思？

His glasses had slipped...

他的眼镜滑掉了。

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。

glasses

n. 眼镜，双筒望远镜，玻璃( glass的名词复数 )，玻璃杯，玻璃器皿，眼镜；

例句
She wore butterfly glasses and had a beehive hairdo.
她戴着一副蝶形眼镜，顶着一头蜂窝式发型。

had

v. 有（ have的过去式和过去分词 ），（亲属关系中）接受，拿，买到；

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

slipped

adj. 打滑，打滑的；v. 滑( slip的过去式和过去分词 )，滑脱，下降，（健康状况等）变差；

例句
They picked up momentum, then slipped into neutral and coasted quietly down the slope.
他们加大油门，再切入空挡，随后没大响动地滑下山坡。