"work in broad strokes"
what does this phrase mean? does stroke mean the movement of a pen or brush while you are painting or writing? and is it metaphorical?

Question

Answer

Hello again;)
-If it is a work of art  
*painting with broad strokes* ,
it means concretely making wide marks with a wide brush.

-It could be an idiom as well having  an indirect metaphorical sense:
Doing any thing in broad strokes means doing it in a general way without giving details.
Example:
"He didn't say much, he just talked in broad strokes".

Answer

If something is described or defined with broad stokes, then only an outline is given, without fine details.

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