double over

double back

To retrace one's steps; to go back where one has already gone.

double booked

Of a single resource, reserved for two different users at the same time.

double bookkeeping

The tendency, among those who experience delusions, to perceive reality and the delusions as both being real, while remaining unbothered by the discrepancy or inconsistencies between the two.

double in brass

To perform two or more tasks within the same project or organization.

double taker

Something causing someone to do a double take.

double tap

A tactical shooting technique of pulling the trigger of a weapon twice in quick succession to deliver two shots to the same target zone.