guard against something
collocation防范某事；预防某事
You should guard against making the same mistake again.
你应该防止再犯同样的错误。
保护；保卫；防卫
先理解核心含义，再看它在真实句子里的用法。
保护；保卫；防卫
To protect someone or something from danger or attack; to keep safe.
The security guard guards the entrance every night.
保安每晚守卫入口。
保护免受危险；确保安全
To protect from danger; to secure against surprise, attack, or injury; to keep in safety; to defend.
看守以防止逃跑或暴力行为
To keep watch over, in order to prevent escape or restrain from acts of violence, or the like.
警戒或防御；保持警惕
To watch by way of caution or defense; to be cautious; to be in a state or position of defense or safety.
用装饰边保护边缘
To protect the edge of, especially with an ornamental border; hence, to face or ornament with lists, laces, etc.
guard
Base
原形
guards
3rd person
第三人称单数
guarding
-ing
现在分词
guarded
Past
过去式
guarded
Past participle
过去分词
I guard the door every night.
我每晚守卫大门。
She guarded the entrance yesterday.
她昨天守卫了入口。
They have guarded the treasure for years.
他们守卫宝藏已有多年。
规则动词，过去式加-ed。
She guarded her younger brother from the angry dog.
她保护弟弟免受那条愤怒的狗的攻击。
You should guard your password carefully.
你应该小心保护你的密码。
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防范某事；预防某事
You should guard against making the same mistake again.
你应该防止再犯同样的错误。
保护某人免受某事（伤害）
The mother tried to guard her children from the harsh reality.
这位母亲试图保护孩子们免受严酷现实的影响。
看守大门
Two soldiers guarded the door to the meeting room.
两名士兵看守着会议室的大门。
保守秘密
She promised to guard the secret for life.
她承诺一生保守这个秘密。
保护个人隐私
It's important to guard your privacy online.
在网上保护你的隐私很重要。
防范；防止
You should guard against making the same mistake again.
你应该防范再犯同样的错误。
用生命保护；极其珍视
She guards her diary with her life.
她极其珍视自己的日记，像保护生命一样。
说话谨慎；管住自己的嘴
He guarded his tongue during the heated argument.
在那场激烈的争论中，他说话非常谨慎。
你要保守你心，胜过保守一切，因为一生的果效是由心发出。
Parents always try to guard their children from danger.
父母总是努力保护孩子远离危险。
谁来守卫守卫者？
We must guard against complacency in our work.
我们必须防止在工作中自满。
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联想：卫兵在城门口守卫，见坏人便大喝'嘎！'（谐音 guard），所以动词 guard 是'保卫、看守'。
语域：neutral 常见场景：security and patrol duties、formal notices and warnings、advice about avoiding risks guard 作动词通常表示“保护、看守或防范”，多用于安全保卫场景和书面提醒；日常口语中表达“小心、提防”时也常说 be careful 或 watch out。
常与against或from连用表示防范
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.