1. (informal) in a state of confusion 
2. (informal) in dispute; in disagreement

Encyclopedia: At sixes and sevens

• cathexis
• cathode
• cathode ray
• cathode-ray oscilloscope
• cathode-ray tube
• cathodic
• catholic
• Catholic Church
• Catholic Pope
• Catholic Reaction Force
• Catholic school
• catholicise
• Catholicism
• catholicity
• catholicize
• catholicon
• Catholicos
• cathouse
• cation
• cationic
• cationic detergent
• catjang pea
• catkin
• catkinate
• catlike