A recognisable situation
Someone says: "You are withholding information." Instead of responding that this is nonsense, the adviser asks: "Which information do you mean exactly, and when did you expect it?" The accusation thus becomes a verifiable question.
A question to consider
What becomes fairer and clearer if we reduce an accusation to one concrete fact?
In plain words
Big words are difficult to resolve. Concrete examples are much more useful. So ask calmly: what exactly do you mean, when did that happen, and what are you basing this on?
The nuance
Do not turn it into a cross-examination. The tone must remain open and inquisitive.
Explanation in own words at What truly moves people and the speaker's compass. Book p. 109; speaker's compass p. 28.
Practice this insight