DONT, which is an acronym for Disturb Opponents' Notrump, is a method for intervening against an opposing 1NT opening bid. It features the following calls:

• Double ? shows any single suit; advancer bids 2♣, after which intervenor corrects to his actual suit
• 2♣, 2♦, 2♥ ? shows the bid suit and any higher-ranking suit
• 2♠ ? shows spades

See also

• List of defenses to 1NT