Maston was oppressed by sinister forebodings.是什么意思？

Maston was oppressed by sinister forebodings.

梅斯顿感到自己被一种不祥的预感紧紧地抓住了.

was

v. 用来表示某人或某物即主语本身，用来表示某人或某物属于某一群体或有某种性质（ be的过去式 ），在，存在，不受干扰；

例句
There was a terrible sadness in her eyes...
她眼神中流露出深深的悲伤。

oppressed

adj. 受压迫的，受压制的；v. 使烦恼( oppress的过去式和过去分词)，压迫，压制；

例句
He had dedicated his life to bettering the lot of the oppressed people of South Africa...
他毕生致力于改变南非受压迫人民的命运。

by

prep. 在…旁边，表示方式，由于，经过；adv. 经过，表示保留或保存时用，短暂拜访；

例句
...expensive make-up that we saw being advertised by a beautiful model...
我们所见的由一位漂亮模特代言的昂贵化妆品

sinister

adj. 危险的，不吉祥的，凶兆的，险恶的；

例句
There is nothing sinister or conspiratorial about the export licensing system.
这种出口许可制度没有任何阴险或者见不得人的东西。

forebodings

n. （对不祥之事的）预感，预知( foreboding的名词复数 )；