dos a dos

Meanings

1. A move in square dancing in which two dancers face each other, then step forward and left until they have right shoulders adjacent, then move to a position where they are back to back, then move to have left shoulders adjacent, then return to facing each other.
2. A sofa, open carriage, etc. constructed so that the occupants sit back to back.

1. Back to back.

Etymology

From French dos à dos (“back to back”), from dos (“back”) (from Latin dorsum (“back”)) and à (from Latin ad (“to”).