Meaning of “lump sth/sb together” - Learner’s Dictionary

lump sth/sb together

phrasal verb with lump uk us /lʌmp/ verb

to put different groups together and think about them or deal with them in the same way:

American and Canadian authors tend to be lumped together.

(Definition of “lump sth/sb together” from the Cambridge Learner’s Dictionary © Cambridge University Press)