It calls for the lead of the higher (or lower) unbid suit.

As before, it denotes support for unbid suits and, often, extra values.

This showed length in the unbid minor suits, and the result was a slaughter.

It was clear that East did not want a club lead, the unbid suit, but he might well want a diamond.

West led the diamond ten, since that was an unbid suit this time, and South won with the queen in dummy.

His mother, he says, taught him to lead the unbid major suit against three no-trump.

Since clubs was the unbid suit, West led that ace and continued.

East had a normal balancing double, since he was happy to hear any of the unbid suits.

An obvious possibility is to double, showing the unbid suits.

Diamonds was the unbid suit, and West did lead a low diamond.