lump together

Scientists have long tried to make single-atom-thick sheets of gold but failed because the metal's tendency to lump together.

The noise from their constant false allegations produces the desired effect of minimizing Trump’s crimes in the court of public opinion, leading exhausted voters to tune out and lump together all politicians facing legal charges.

As they burned, they fused those ingredients into heavier elements that astronomers lump together as “metals.”

Now they’ll only lump together requests received within two months of each other.

Creating different classes of brain fog, then, requires us to lump together symptoms that could be severe, for example, but still variable from person to person.