词典释义：
displaying or proceeding from a lack of careful consideration of the possible consequences of an action
鲁莽的，轻率莽撞的；急躁的
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it would be extremely rash to make such an assumption 做出这样的假定是极为轻率的
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a rash decision .轻率的决定。
an area of reddening of a person's skin, sometimes with raised spots, appearing especially as a result of illness
疹，疹子。
a series of things of the same type, especially when unpleasant or undesirable, occurring or appearing one after the other within a short space of time
（短时间内的）一连串（尤指始料不及的坏事）
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a rash of strikes by health-service workers .医疗卫生工作者举行的一连串罢工。
"late Middle English （also in Scots and northern English in the sense ‘nimble, eager’）： of Germanic origin； related to German
