Collins COBUILD Advanced Learner's English Dictionary - lump together

If a number of different people or things are lumped together, they are considered as a group rather than separately. Policemen, bankers and butchers are all lumped together in the service sector... Because she was lumped together with alcoholics and hard-drug users, Claire felt out of place. PHRASAL VERB: usu passive, be V-ed P, be V-ed P with n