speak out of turn

/S P IY1 K AW0 T AH0 V T ER0 N/
verb
  1. 1

    To make a remark or provide information when it is inappropriate or indiscreet to do so, or when one does not have permission or the authority to do so.

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Source: https://en.wiktionary.org/wiki/speak%20out%20of%20turn, https://en.wiktionary.org/wiki/talk%20out%20of%20turn