Lockdown
“Lockdown” 是一个名词，指为安全目的将人们限制在特定区域（如房间、牢房、家中）的措施。常见于：① 学校或监狱发生紧急情况时的封锁；② 疫情期间的居家令、封城；③ 其他安全威胁下的限制措施。该词强调”锁住”以隔绝危险或防止扩散。
- “The school went into lockdown when an intruder was reported on campus.” (校园报告有闯入者后，学校进入封锁状态。)
- “During the pandemic, many countries imposed strict lockdowns to curb the spread of the virus.” (疫情期间，许多国家实施严格封锁以遏制病毒传播。)
- “The prison was on lockdown after a riot broke out in one of the wings.” (其中一个监区发生暴动后，监狱进入封锁状态。)
由 lock（锁住）+ down（下来、关闭）组成的复合词。lock down 作为动词短语意为”锁紧、封锁”，名词化后指实施封锁的状态或时期。
- 词根: lock (锁) + down (下、关闭)
- 无前缀和后缀，为复合词
“Lockdown” 在 2020 年新冠疫情后成为全球日常词汇。各国实施的 lockdown 措施（居家令、非必要商铺关闭等）深刻影响了经济、教育和社会生活。该词也常用于描述美国校园枪击等事件中的”就地避难”（shelter-in-place）程序。
- 固定搭配: “go into lockdown” (进入封锁), “impose a lockdown” (实施封锁), “lockdown measures” (封锁措施)
- 动词短语: lock down (封锁)
Lock（锁）+ down（下）。把一切”锁下去”、关起来，即封锁。联想：疫情时大家被”锁”在家里”down”。
“When the lockdown was announced, Sarah stocked up on groceries and settled in for what she thought would be two weeks. It turned into months of working from home and video calls with family.” (封锁令宣布时，萨拉囤了 groceries，准备迎接她以为的两周。结果变成了数月在家工作和与家人的视频通话。)