keep one's own counsel

/K IY1 P W AH0 N EH0 S OW0 N K AW0 N S AH0 L/
verb
  1. 1

    To keep one's own business private; to be discreet, careful, or circumspect in what one says concerning one's own thoughts, deeds, or situation.

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Source: https://en.wiktionary.org/wiki/keep%20one's%20own%20counsel