Younger brother.

Meaning: This means a brother who is younger than someone else, usually the speaker. It's like saying, He is a male sibling who is younger than me.

Choice of Words: Younger is an adjective that means less old or mature. Brother is a noun that refers to a male sibling. When you put them together, "Younger brother" refers to a male sibling who is younger than the speaker.

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Related Expressions