Unbolt vs Uncouple - What's the difference?

As verbs the difference between unbolt and uncouple

is that unbolt is to undo a bolt; to unlock while uncouple is to disconnect or detach one thing from another.

(en verb)

to undo a bolt; to unlock

* Shakespeare

He shall unbolt the gates.

(uncoupl)

To disconnect or detach one thing from another.

* We uncoupled the trailer and left it behind

To come loose.

To loose, as dogs, from their couples.