Yes that is true, when talking about "any" bid. Another question by the way. Is there a term for the "pair" that makes the defensive bidding. Defenders relate only to the play. What do we call the side that intervenes?
That sounds logical too. Maybe something even better will pop up. If we look at it only from the advancer's point of view the situation is either a) RHO passed b) RHO bids or doubles. (RHO is the responder - openers partner).
It is the overcall that has been contested ...
Brian, is not an overcall the accepted term for the bid of the "intruder"? I think it is, and then I think it should be natural to name the person "overcaller".
I agree. Both openings and responses are weaker today. When the bidding starts 1X-P-1Y our side can have as much as 25-26 HCP nowadays, since responses to the weaker openings also are often made with 3-5 HCP.