noun
a thick, sticky substance produced by the mucous membranes in the respiratory system, typically as a result of infection or irritation
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The doctor explained that phlegm is a thick, mucus-like substance produced by the respiratory system.
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I hate it when I have to cough up phlegm when I'm sick.
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I can't stand the feeling of all that phlegm in my throat.
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His words were like phlegm, thick and hard to swallow.