lest的意思是：conj.惟恐；以免；担心。lest的例句是用作连词(conj.)They spoke in whispers lest they should be heard.他们低声说话，唯恐被别人听见。lest【近义词】for fear that以免。
一、详尽释义点此查看lest的详细内容
二、双解释义
三、词典解释
1.唯恐；免得
If you do somethinglest something unpleasant should happen, you do it to try to prevent the unpleasant thing from happening.
e.g. I was afraid to open the doorlest he should follow me...
我不敢开门，唯恐他还跟着我。
e.g. The president has gone along with the hardlinerslest they be tempted to oust him...
总统同意了强硬派的意见，以免他们产生赶他下台的念头。
四、例句
They spoke in whispers lest they should be heard.
他们低声说话，唯恐被别人听见。
He took a flashlight lest it should get dark before he returned.
为了预防回来以前天就黑了，所以他带着手电筒。
I got up early lest I should miss the train.
我早起以免错过了火车。
We talked in a low voice lest we should wake the baby up.
我们小声说话以免吵醒婴儿。
I was afraid lest the new car should be stolen.
我担心新汽车会被偷走。
五、词汇搭配
六、经典引文
Lord God of Hosts, be with us yet, Lest we forget, lest we forget.
出自：R. KiplingShe drew in her breath lest he should hear it now.
出自：M. Sinclair七、词源解说
lest的相关近义词
for fear that、perchance、in case、so as not to、fear、in、that、if、for、order、to、avoid
lest的相关临近词
let、lessor、Lesti、Lesto、Lestr、leste、Lesty、Lesta、Lestan、Lestum、Lestor、Lester