"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?

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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.

집에서 편안하게 언어를 배울 수 있는 기회를 놓치지 마세요. 경험 많은 강사진을 살펴보고 지금 바로 첫 수업을 신청하세요!