Origin of no-trump
Examples from the Web for no-trump
The same line of reasoning should be followed when the partner has called two of a suit over a No-trump.
This doctrine is extended to all cases of the original lead of an Ace against a No-trump declaration.
The conservative and safe course to follow with a holding of the character described is to pass the one No-trump.
As the adversaries have the lead and the privilege of doubling, a weak suit exposes the hand to some danger at no-trump.Bridge; its Principles and Rules of Play|J.B. Elwell
When the partner has not shown strength, the leader, against a No-trump, should open his own long suit.