speak out of turn

Anthony Horowitz の "The House of Silk" からの引用です。
'You were glad that Mr Carstairs married?'
'We were delighted, sir, as well as surprised.'
'Surprised?'
'I wouldn't wish to speak out of turn, sir but Mr Carstairs had formerly shown no interest in such matters, being devoted to his family and to his work. Mrs Carstairs rather burst in on the scene but we are all agreed that the house has been better for it.'
"speak out of turn" が分かりません。辞書を見ます。
・Oxford English Dictionary: Speak in a tactless way.: She was the first to take umbrage if they spoke out of turn.
・Collins Dictionary: If you speak out of turn or talk out of turn, you say something that you do not have the right or authority to say.: I hope I haven't spoken out of turn.
・Farlex Dictionary of Idioms: To say something erroneous, foolish, or impudent at an inappropriate time, or to speak when one does not have the authority to do so.: I hope I'm not speaking out of turn, but I think we'd see a higher profit margin if we took better care of our employees' benefits.
政治家がかわりばんこ(in turn)に　"speaking out of turn" でマスコミのネタになっていますね。