Sofia's throat had tightened and she couldn't speak...是什么意思？

Sofia's throat had tightened and she couldn't speak...

索菲娅喉咙哽住了，说不出话来。

throat

n. 咽喉，颈前部，[植物学]管颈；vt. 用沙哑的声音或嗓音发音；

例句
My throat constricted, so that I had to concentrate on breathing.
我的嗓子发紧，所以我不得不把注意力集中在呼吸上。

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。

tightened

v. 收紧( tighten的过去式和过去分词 )，（使）变紧，（使）绷紧，加紧；

例句
...in 1987, when the government tightened fiscal policy.
在1987 年，当时政府紧缩财政政策

and

conj. 和，与，而且，于是，然后，因此；

例句
I spend a lot on expensive jewelry and clothing...
我花很多钱购买昂贵的首饰和衣服。

she

pron. 她，它；

例句
Her lover walked out on her after she had aborted their child.
她的情人在她打掉胎儿后甩了她。

speak

vt.& vi. 讲，谈，演说，从某种观点来说；

例句
Do you speak any foreign languages?...
你会说外语吗？