See also: brother in law

English edit

Alternative forms edit

Etymology edit

From Middle English brother-in-lawe; equivalent to brother +‎ -in-law.

Pronunciation edit

Noun edit

brother-in-law (plural brothers-in-law or (archaic) brethren-in-law or (colloquial, nonstandard) brother-in-laws)

  1. A male relative of one's generation, separated by one degree of marriage:
    1. The brother of one's spouse.
    2. The husband of one's sibling.
  2. (uncommon) Co-brother-in-law: A male relative of one's generation, separated by two degrees of marriage:
    1. The husband of the sibling of one's spouse.
      • 2009, Donal Lowry, “Kettle, Thomas Michael (‘Tom’)”, in Dictionary of Irish Biography, Cambridge University Press:
        He was appalled by trench conditions and the prolongation of the war, a disillusionment further encouraged by the Easter rising, in which his brother-in-law, Francis Sheehy-Skeffington (qv), was murdered by a deranged Anglo-Irish officer, J. C. Bowen-Colthurst (qv).
    2. The brother of the spouse of one's sibling.

Quotations edit

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