Definitions for "Double for Less"
Keywords:  wager, bet, exaggerated, less, down
To double for less than your initial wager
To double for less than your original bet. Not a recommended move. To take an exaggerated example, if you had a 1000 dollar bet up, would you double down for 1 dollar? You are taking all the risk of getting only one card, bet as much as you can.
Doubling down with less than two times the original bet. Typically, when doubling is permitted, the player is not required to literally double his bet, but may raise it by any amount up to (but not more than) the original bet.