A bid that indicates lack of support for partner’s suit (e.g. 1♠-Pass-1NT), or general weakness such as the 2♦ response to an Acol 2♣ opening.
A bid that indicates lack of support for partner’s suit (e.g. 1♠-Pass-1NT), or general weakness such as the 2♦ response to an Acol 2♣ opening.