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The hot chicken soup made it easier for him to expectorate the phlegm from his lungs.
How about this:
"You're the spitting image of my mother, so how could I ever expectorate with you???"
when my mom had pneumonia, she would often expectorate phlegm like mucus.
An antonym is a word that means the opposite of another word. An antonym that can be used for the word expectorate is suppress.
Expectorate