John Gill Commentary 2 Samuel 14:18

"Then the king answered and said unto the woman, Hide not from me, I pray thee, aught that I shall ask thee. And the woman said, Let my lord the king now speak." — 2 Samuel 14:18 (ASV)

Then the king answered and said to the woman
Understanding plainly what she meant by all this, that the case she brought was a feigned one, and that the intention of it was to let him know the sense of the people with respect to Absalom, and the recall of him:

hide not from me, I pray you, the thing that I shall ask you ;
he suspected that this was not a scheme of her own, but some considerable person had formed it, and made use of her to execute it, which was what he desired to know:

and the woman said, let my lord the king now speak ;
ask what question he pleases, I am ready to answer.