Paint something with a broad brush - Idioms by The Free Dictionary
paint something with a broad brush
paint (something) with a broad brush
To describe or characterize something in very general, vague, or broad terms, ignoring or neglecting to include specific details. When asked about how she would stabilize the economy, the candidate painted her plan with a broad brush, resorting to vague claims about creating jobs and getting people back to work.
paint something with a ˌbroad ˈbrush describe something in a general way, ignoring the details: His description of national politics is painted with a very broad brush, although some areas are described in a little more detail than others. ▶ ˌbroad-ˈbrush adj. [only before noun] dealing with something in a general way rather than considering details: a broad-brush approach