Make a clean breast

He preſſed him earneſtly to make a clean breaſt, and tell him all he knew of [Colin Roy Campbell of] Glenure's murder. To which Breck [i.e., Alan Breck Stewart] anſwered with an oath, that he had never ſeen Glenure dead or alive.

"Master," he said that day to me, "this must come to an end. I must make a clean breast of it. This Nemo is leaving land and going up to the north. But I declare to you that I have had enough of the South Pole, and I will not follow him to the North."

'It is well, then, that we should be frank,' said the other. 'We both think more than we have said; let us make a clean breast. This masked figure that you saw, did you recognise it?'

You know no doubt that most criminals at some time or other feel an irresistible need of confessing—of making a clean breast of it to somebody—to anybody.

I had lied to Paddock about him, and the whole thing looked desperately fishy. If I made a clean breast of it and told the police everything he had told me, they would simply laugh at me.

Instead, imagine that a software project manager approaches you and makes a clean breast of his uncertainty about your proposed project: "Look, there are unknowns here, and we have catalogued the following eleven of them."