Wiktionary
vb. (en-pastdouble down)
Usage examples of "doubled down".
Alert, almost certain a bullet would meet him, he doubled down close to the floor.
He doubled down, seemed to merge with the tall mountain grass, and scuttled forward.
The woman--whicho must be only a few years older than she, Leia thought--ducked down an alley, and Leia ran on past its mouth, then doubled down the narrow lane beyond.
I left home at the usual time carrying my school satchel, then doubled down and back around the edges of lowtown, trod the cabbage leaves through the failing allotments, crossed Withybrook Road and followed the railway tracks around the side of Rainharrow to the point where that lonely branch line dipped across the moors.
Behind them, several squads of Russian soldiers, rifles at the ready, emerged from the side streets and doubled down towards the square.
To the delight of the fans as well as his teammates on the bench, he doubled down the right field line.