Their faces were pinched with grief.是什么意思？

Their faces were pinched with grief.

他们的面容因悲伤而憔悴。

their

pron. 他（她，它）们的，在提及性别不详的人时，用以代替 him 或 her；

例句
Their permissiveness toward their children reflects the wild abandon of their own lives.
他们对孩子的放任折射出他们自身生活的放浪形骸。

faces

n. 面容( face的名词复数 )，表面，脸，方面；v. 面对( face的第三人称单数 )，面向…，正视，承认；

例句
Smiles, nods, and cheerful faces added to the general gaiety.
微笑、点头和喜洋洋的脸庞使喜庆的气氛变得更浓了。

were

be的过去时复数和第二人称单数形式，有时代替 was,用于条件从句、动词 wish 之后等；

例句
Shops, houses, and vehicles were set ablaze.
店铺、房子和车辆全都陷于火海。

pinched

adj. 短缺的，匮乏的；v. 夹痛( pinch的过去式和过去分词 )，逮捕，盗窃，使入不敷出；

例句
The problem was finally, though not conclusively, identified as a severely pinched nerve...
问题终于被认定为是神经受到严重挤压，尽管这还不是最终结论。

with

prep. 和，跟，随着，关于，和…一致；

例句
A waiter entered with a tray...
侍者端着托盘进来了。

grief

n. 悲伤，悲痛，悲伤的事；

例句
His grief was etched into every line of his face...
他一脸悲伤。