Uncouple (verb)

To separate or disconnect two things that were previously connected or joined.

Origin:

From un- + couple.

Examples:

1. He uncoupled the train cars.
2. She uncoupled the necklace to clean it.
3. He uncoupled the hose from the faucet.
4. The rocket stage uncoupled from the main spacecraft.
5. The uncoupled atoms formed a new molecule.