Feeling sick or unwell.
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When someone is under the weather, they’re not feeling their best — usually with a cold, headache, or general tiredness.
The phrase is used for mild illness, not serious conditions.
"Out of Sorts"
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Feeling irritable or off in mood, not physically sick
"Feeling Blue"
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Feeling sad or emotionally low, not physically unwell
"Under the Weather"
—
Feel physically sick or unwell