brother-in-law

noun

broth·​er-in-law ˈbrə-t͟hər-ən-ˌlȯ How to pronounce brother-in-law (audio)
ˈbrət͟h-rən-,
ˈbrə-t͟hərn-
plural brothers-in-law ˈbrə-t͟hərz-ən- How to pronounce brother-in-law (audio)
1
: the brother of one's spouse
2
a
: the husband of one's sibling
b
: the husband of one's spouse's sibling

Examples of brother-in-law in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Providing more context, the woman noted that her brother-in-law has two sets of children, the oldest of whom are in their 20s. Erin Clack, People.com, 12 Apr. 2025 Mayor Fulop confirmed in an X post a brother-in-law of the family that died in the wreck was flying into the country Friday morning. Alexandra Koch, FOXNews.com, 11 Apr. 2025 Fulop further added that a brother-in-law of the family was due to fly in Friday morning as officials worked with the medical examiner to expedite the release of the bodies back to Spain. Eric Lagatta, USA Today, 11 Apr. 2025 Among the mourners was Juancho Guillén, who lost his wife three months ago and whose brother, sister and brother-in-law died at Jet Set. Martín Adames Alcántara and Dánica Coto, Los Angeles Times, 10 Apr. 2025 See All Example Sentences for brother-in-law

Word History

First Known Use

14th century, in the meaning defined at sense 1

Time Traveler
The first known use of brother-in-law was in the 14th century

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Cite this Entry

“Brother-in-law.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/brother-in-law. Accessed 19 Apr. 2025.

Kids Definition

brother-in-law

noun
broth·​er-in-law
ˈbrət͟h-(ə-)rən-ˌlȯ,
ˈbrət͟h-ərn-ˌlȯ
plural brothers-in-law
ˈbrət͟h-ər-zən-
1
: the brother of one's spouse
2
: the husband of one's sibling or of one's spouse's sibling

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