Dou"ble, v. i. 1. To be increased to twice the sum, number, quantity, length, or value; to increase or grow to twice as much.
'T is observed in particular nations, that within the space of three hundred years, notwithstanding all casualties, the number of men doubles.
T. Burnet.
2. To return upon one's track; to turn and go back over the same ground, or in an opposite direction.
Doubling and turning like a hunted hare.
Dryden.
Doubling and doubling with laborious walk.
Wordsworth.