Zelandakh, on 2012-July-16, 05:54, said:
I had a variant of this happen at the weekend. My RHO opened 1NT and I bid 2♣, alerted by my partner. LHO now starts taling to herself but due to a combination of turning her head slightly to the left and speaking a foreign (to me) language I did not catch what she said. My partner did though and I found out later she had said something like "That's the normal thing", which presumably meant Landy (it wasn't). However, what is of interest to me is whether I am allowed to know what was said, since this would be AI to me. After all, if I am not allowed then how can I judge whether RHO has used UI later on? (she probably did, rebidding 3♣ on her 3334 hand.) Would it make a difference if my partner was deaf, or if it was my partner who did not hear and I heard but did not understand (being in a foreign language)?
I think you must be entitled to know everything said by your opponents (when screens are not in use). One particular reason for this is your duty (Law 20F5b) to correct your partner's explanations if these in your opinion are incorrect in any way. You usually cannot tell for sure if your partner's answer is correct unless you know the question asked.
However, I don't think that you are entitled to request a repetition of what opponents have said other than at times when you yourself may ask questions.