Once the opposing partnership have bid a suit are there any circumstances in which you should also bid the suit? A bid of the opponent’s suit is unlikely to be a natural bid, but sometimes it can have a special meaning.
The most common reason for making a bid in the opponent’s suit is to ask your partner if they have a stopper in that suit.
Take a look at this example:
Your hand: West
S: A J 4
H: A J 8
D: A K 7 3
C: 9 5 4
Following East’s bid of 2 Hearts, West would usually rebid 2NT. However, North’s overcall of 2C implies strength in clubs and West doesn’t have a stopper in clubs. We needs to know if partner has a stopper in clubs. West therefore bids the same suit as North. Partner (East) will bid NT if they hold a stopper. If they don’t they will make another, suitable bid to tell West something more about their hand.