verb
to decay or rot, especially through the action of bacteria or fungi
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If organic matter is left to decompose for too long, it will putrefy and produce foul odors.
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Don't leave those leftovers in the fridge for too long, they'll putrefy and stink up the whole kitchen.
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I forgot to take out the trash and now the garbage is starting to putrefy. Gross!
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Hate and resentment can putrefy in a person's heart if not addressed and resolved.