noun
a type of breath characterized by an unpleasant odor
adjective
describing the quality of the breath as unpleasant
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Poor oral hygiene can lead to bad breath, also known as halitosis.
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Make sure to brush your teeth regularly to avoid bad breath.
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Dude, your breath is kicking! You have some serious bad breath going on.
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Her lies were like bad breath, impossible to ignore and leaving a lingering unpleasantness in the air.