at sixes and sevens

Meanings

1. In a state of confusion.
2. In a state of dispute or disagreement.

Etymology

From earlier on six and seven, from Middle English on sixe and sevene, of unknown origin, though it may have originated from the game of hazard and the Old French cinc (“five”) and sis (“six”), the riskiest numbers to shoot for, which were either misheard as as "six" and "seven" or increased by one each as a form of exaggeration.