Describes an event or action that occurs so suddenly and swiftly that there is no time to react or take precautions. Similar to 'as quick as a flash of lightning, giving no time to cover the ears'.
那场暴雨来得疾霆不暇掩目，我们还没来得及收衣服，阳台就全湿了
The sudden downpour came as quick as a flash of lightning, leaving no time to cover our eyes; we hadn't even had time to bring in the clothes before the balcony was drenched.
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