Other forms: sweepings
Something that's sweeping is wide-ranging or thorough. A political candidate might campaign on promises to bring sweeping change to a country.
Sweeping things can be extensive, like the sweeping powers a president has in a dictatorship, or curving, like the sweeping motion a dancer makes with his arm. Sweeping can also mean "overly broad," so if you make a sweeping generalization, you take a general idea or rule and apply it too widely, without allowing any exceptions to it.