Extremely sensitive or hyper-vigilant, often due to a weakened physical state or old age, causing one to overreact to minor sounds or events (literally, mistaking the sound of ants under the bed for fighting oxen).
他最近精神有些紧张，草木皆兵，真是有点床下牛斗了。
He has been quite nervous recently, imagining danger everywhere; he's truly become overly sensitive, mistaking trivial things for serious matters.
Era:
Ancient
Frequency:
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