lose speed

He dare not climb, for he would lose speed, and would not be able to escape.

If it is necessary to turn her rudder much she will lose speed and will not rank in the first class.

In order not to lose speed, therefore, it must travel in as straight a line as possible.

They cannot afford to lose speed by a cross with slower hounds.

He had no intention in his wooing to make haste and lose speed.