Answer: uncouple

AnswerCrossword Clue
UNCOUPLESeparate
UNCOUPLEDisconnect
UNCOUPLEDisconnect, as railroad cars.
UNCOUPLELoose a caboose
UNCOUPLEDisconnect, in a way
UNCOUPLESeparate, in the rail yard
uncoupleto disconnect
uncoupleDisconnect (something, esp. a railroad vehicle that has been coupled to another)
uncoupleBecome disconnected
uncoupleRelease (hunting dogs) from being fastened together in couples