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verb American English pronunciation: become /bɪˈkʌm/ 
Word Forms
present tense
present participlebecoming
past tensebecame
past participlebecome
Become can be used in the following ways:
as a linking verb (followed by an adjective or noun complement): The problem became worse. ♦ He became president in 2001.
as a transitive verb: Blue is a color that becomes you.
  1. 1
    to start to be something [linking verb]
    1. a.
      to change and start to be something different, or to start to have a different quality

      The sky became dark.

      People were becoming increasingly angry about the delay.

      Christine decided to become a writer.

      São Paulo has become the largest city in South America.

    2. b.
      to begin to have a particular job or position of authority, or to begin to be a member of a group

      In 1603 James became King of England.

      It was Mr. Berry who encouraged Christine to become a writer.

      The following year Easton became an American citizen.

    3. c.
      to begin to be used for a different purpose

      What sort of building was it before it became a museum?

  2. 2
    [transitive] formal if something becomes you, it is suitable for you or it makes you more attractive

    That red dress really becomes her – it goes with her hair.

phrasal verbs

This is the American English definition of become. View British English definition of become.