Possible Clues:

• Disconnect, as oxen
• Break up, as a bovine team
• Free, in a way
• Break up a team?
• Let all the, all the oxen free?
• Unhitch
• Disjoin, as a pair of oxen
• To remove a harness or, more generally, set free
• Release, as oxen
• Disjoin, as oxen