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take someone's part
Fig. to take a side in an argument; to support someone in an argument. My sister took my mother's part in the family argument. You are always taking the part of the underdog!
take part (in something)
to participate in something. Bill refused to take part in the game. Everyone is asked to take part in the celebration.
Play a role in, share in, participate, as in Will you be taking part in the wedding? or He did not take part in the discussion. [Late 1300s] Also see take one's part.
take (someone's) part
To side with in a disagreement; support.
To join in; participate: She took part in the celebration.