whistle-blow verb1 •(rare) To blow the whistle (on); to report (as a whistleblower).It was at this point that 46 (77%) of the participants whistleblew (in writing) on the cheating confederate. — 2002 formswhistle blew · whistle-blew · whistle blown · whistle-blown · whistle-blowing · whistle blows · whistle-blows
