From Longman Dictionary of Contemporary Englishbrother-in-lawˈbrother-in-law ●●○ noun (plural brothers-in-law) [countable] 1 FAMILYthe brother of your husband or wife2 FAMILYthe husband of your sister3 FAMILYthe husband of your husband or wife’s sister → sister-in-law
Examples from the Corpus
brother-in-law• Not for nothing have I a brother-in-law who cooks professionally.• She's needed to look after her sister and brother-in-law.• She took up the pastime after impressing friends and family when she made an engagement cake for her brother-in-law.• He turned over my brother-in-law, you know.• My brother-in-law began setting up our platform, and I made the mistake of telling him to get a move on.• Military resistance was organized by Sidonius's brother-in-law, Ecdicius, son of the emperor Avitus.• He was the brother-in-law of some one she knew. 