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somebody

pron. · n.
US //ˈsəmˌbɑdi// UK //sˈʌmbɒdi// some·body
  1. 1 an unknown person (pron.)
    A1 Beginner

    a person, but you do not know or say exactly who they are.

    an unspecified or unknown person. Functions as a singular pronoun and typically takes a singular verb.

    Example

    Somebody left the front door open, and now the house is freezing.

    Example

    Somebody must have entered the building after the security guard finished his rounds, as the alarm was triggered at midnight.

    Pitfall
    Somebody have left their umbrella.
    Somebody has left their umbrella.

    Even though 'somebody' refers to people in general, it is grammatically singular and requires a singular verb like 'has' or 'is'.

  2. 2 an important person (n.)
    B2 Upper Intermediate Informal

    a person who is famous, successful, or important.

    a person of importance, authority, or celebrity status. Often used in contrast with 'nobody'.

    Example

    He worked hard because he really wanted to be somebody one day.

    Example

    After years of playing minor roles in local theatre, she finally became a somebody in Hollywood following her breakout performance.

Origin

From Middle English sum body, equivalent to some + body.

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