Definition of one's best friend in English:

one's best friend

  • One’s closest friend: Michael was Frank’s best friend he’s best friends with Eddie
    More example sentences
    • So, that's what happens when you try to talk to your best friend about his girl friend.
    • During the second and last weeks of the summer program, children were interviewed individually and asked to name their best friend and two other friends from their summer program class.
    • I had lied to my friend, probably my best friend, and made her feel like a fool when I was the one playing stupid games.
See parent entry: best

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Word of the day coloratura
Pronunciation: ˌkələrəˈto͝orə
noun
elaborate ornamentation of a vocal melody