弟媳 (dì xí) means “sister-in-law” | MotiTan Chinese Dictionary

More examples

我常和弟媳一起做饭。wǒ cháng hé dì xí yì qǐ zuò fàn

I often cook with my younger brother's wife.

A married woman whose place in the family comes through a younger brother.

弟媳妇dì xí fù: A common conversational term for the wife of a younger brother.
媳妇xí fù: A familiar family term for a wife.

表示嫁给自己弟弟的女性，即指弟弟的配偶。biǎo shì jià gěi zì jǐ dì di de nǚ xìng jí zhǐ dì di de pèi ǒu

In 弟媳 (dìxí, "younger brother's wife"), 弟 (dì, "younger brother") identifies the family link and 媳 (xí, "wife") identifies her role.

Chinese kinship vocabulary often marks age order more precisely than everyday English, making this term useful when family conversations distinguish older and younger brothers.