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Definition of Under the weather
Medically reviewed by Dr. Otari Nergadze, Neurosurgeon | Updated: January 2026
Under the weather: Colloquial expression for sick or ill as, for example, to be under the weather with the flu. The phrase "under the weather" came from British sailing ships. When a sailor became ill he was confined below deck out of the weather, so it was said that he was under the weather.