sister-out-law

From sister +‎ -out-law, by analogy to sister-in-law.

sister-out-law (plural sisters-out-law)

1. The sister of one's boyfriend or girlfriend.
2. Girlfriend of one's brother or sister.
   • 2008, John Crawley, Among the Aspen‎, →ISBN, TDrcNfNKVH4C, page 114:

     I, on the other side, was ready to strangle my almost sister-in-law. (My sister out-law.)

   • 2013, Howard Balloch, Semi-Nomadic Anecdotes‎ (Biography & Autobiography), →ISBN, jwc6BgAAQBAJ, page 59:

     This included Prunella Tuff, my “sister-out-law”, a term we invented to describe the relationship between us as she was the sister of my brother in-law, Tim Tuff.

   • 2014, Janice Ryan Hall, Deadly Ties: Sequel to Blood Ties‎, volume 2 (Fiction), →ISBN, D1dXDQAAQBAJ, page 565:

     “If you're openly gay, wouldn't that make you his sister-out-law?”

   • 2015, Katherine Woodward Thomas, Conscious Uncoupling: 5 Steps to Living Happily Even After‎ (Family & Relationships), →ISBN, 2pv0BQAAQBAJ, page 59:

     I, on the other side, was ready to strangle my almost sister-in-law. (My sister out-law.)

3. The sister of one's ex-spouse.

• sister-in-law

• brother-out-law
• daughter-out-law
• father-out-law
• mother-out-law
• son-out-law