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Related to lump together: poo-pooing
1. To collect or gather disparate things into a single indiscriminate mass or group. A noun or pronoun can be used between "lump" and "together." Don't lump together all these clothes before they go in the wash—separate out lights and darks first!
2. To put or categorize someone or something in the same manner or group as someone or something else, especially in a careless, hasty, or indiscriminate manner. A noun or pronoun can be used between "lump" and "together." We shouldn't be lumping Tom together with those other troublemakers just because he broke the rules one time. My novels are all high fantasy books written for adults, but most books stores still lump them together with stuff aimed at kids and young adults.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
lump someone and someone else togetherand lump something and something else together
to classify people or things as members of the same category. You just can't lump Bill and Ted together. They are totally different kinds of people. I tend to lump apples and oranges together.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
To put people or things in the same group or category indiscriminately: The teacher lumped the puzzles and the books together in the toy box. Those students are friends, but I wouldn't lump them together in the same clique.
The American Heritage® Dictionary of Phrasal Verbs. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.