وقتی یک صفتی ( استعداد هنری، بیماری، خصوصیت اخلاقی . . ) در خانواده رایجه و یک جورایی ارثیه میگن اون چیز در خانواده جریان داره یا رایجه.
If a quality, ability, disease, etc. runs in the family, many members of the family have it:
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مثال
Intelligence seems to run in that family.
We're all ambitious - it seems to run in the family.
Music runs in our family
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مثال