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Re:Google Buys Fitbit for $2.1B by papln on Friday November 01, 2019 @02:22PM (#21422124)
"Painting with a broad brush" is not an idiom, since it's meaning is deducible from its content, not only its contex. It's a metaphor (literally false as written, but calls to mind an analogy with truth -- both the comment and broad brushes apply the same thing to many targets without any careful differentiation)

http://learnersdictionary.com/qa/Idioms-metaphors-similes-an....

Re:Google Buys Fitbit for $2.1B by braythwayt on Friday November 01, 2019 @08:06PM (#21424970)
Great link, thank you, I will use these words with more rigor in future. I think that “metaphor” is a much better word for the thing that is used to illustrate or add emotional oomph to an idea rather than to argue its merits.