Usage Note
Schwägerin is the sister of one's spouse, or the wife of one's sibling. It is a basic kinship term alongside Schwager. Sometimes used loosely for the wife of a male cousin or close friend, though strictly that is not the technical meaning.
Examples
"Meine Schwägerin und ich gehen jeden Dienstag zusammen joggen."
Natural Translation
My sister-in-law and I go jogging together every Tuesday.
Literal Translation
My sister-in-law and I go every Tuesday together jogging.

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