noun
a cancerous tumor or growth that spreads and invades surrounding tissues
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The doctor informed the patient that the tumor was a malignant growth and would require immediate treatment.
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The doc said the lump was a bad one and needed to be taken care of right away.
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The growth turned out to be a nasty one that needed to be dealt with ASAP.
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The malignant growth of corruption within the organization needed to be rooted out before it spread further.