The story in learner-safe form
草木皆兵 is usually remembered as a fear image from military history: after shock and pressure, ordinary grass and trees look like enemy soldiers. Modern use keeps that psychology. A person or team has been frightened, so they overread harmless signals. English speakers should not treat the idiom as a simple word for caution. It names fear-distorted perception, where the mind supplies enemies before the evidence does. 草木皆兵 is about fear spreading across perception. After shock, defeat, rumor, or pressure, ordinary grass and trees begin to look like enemy soldiers. The phrase is therefore close to panic, but it is more visual than a general word for anxiety. English speakers should separate it from responsible caution. If there is real evidence of danger, the phrase may unfairly mock the person. It fits best when fear makes harmless signs look threatening. For this entry, the origin note is only the beginning of the explanation. The useful question is why 草木皆兵 survived as a portable judgment rather than as a decorative allusion. The classical story route gives the reader an image, but the modern sentence must still prove its own fit. A learner should ask three things: what concrete object is being judged, what evidence in the sentence supports that judgment, and what tone the phrase adds that a plain English adjective would not add. This is why the page tests 草木皆兵 through security panic, market anxiety, meaning boundary, usage boundary, misuse boundary; each context changes the pressure on the phrase and shows whether the idiom is acting as praise, warning, neutral description, or criticism. The story or usage background also has a translation boundary. 草木皆兵 can point toward see enemies everywhere, be jumpy and paranoid, mistake harmless signs for threats, but those English choices are not interchangeable. One version may preserve the image, another may sound natural in a classroom answer, and another may be safer in a workplace or essay sentence. The entry therefore treats public references as source cards, not as a paragraph order to imitate. Headword checks, story labels, and English equivalents are separated first; only after that are they rebuilt into the learner path used here: answer, label, examples, wrong-use clinic, comparison, story, and practice. The most common failure is overextension. Because 草木皆兵 has a memorable surface, learners may reach for it whenever a topic feels close. The better habit is to compare it with 杯弓蛇影 and 井底之蛙 and with 胸有成竹 and 一针见血 before writing. If the rejected phrase is hard to reject, the sentence probably has not supplied enough evidence. If the rejected phrase is easy to reject, the learner can explain the boundary and use 草木皆兵 with confidence. That is the practical purpose of the origin section: it turns cultural memory into a sentence-level decision instead of leaving the reader with a story and no next action. This retelling is intentionally not a long quotation. It gives the visible action, the mistake or insight, and the modern use boundary so a reader can remember the story without treating every later sentence as a historical claim.