Simple past tense and past participle of lump.(verb)
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Use "lumped" in a sentence
"Perhaps the regulators saw the title and lumped me with writers like Gordon Chang, who has been predicting a collapse of China for more than a decade."
"As well, it is our conviction that these behaviors cannot be "lumped" under behavioral strategies used for biological children - each internationally adopted child and family benefits from individualized assessment and support from psychology, education, therapy, and social worker specialists."
"But folks are acting like he was entitled to be lumped in with Clinton and Obama instead of Richardson and Biden. again, he BEAT clinton. barely edging out or not. he got 30% of the vote! richardson and biden got 2% and 1%. i think that's pretty conclusive in terms of where he deserves to be 'lumped'. your argument is a complete fraud."