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Difference between Down someone’s street and Up someone’s street

down someone’s street—(coll., also: down someone’s alley) within smb.’s competence or interest:

  • The historical line of inquiry is outside your scope, but the analysis of the book is right down your street.

up someone’s street—(also: up someone’s alley) = down someone’s street:

  • A great many of the books published today are, as the saying is, right up her street.