1separate, disengage, or dissociate (something) from something else:the mountings effectively decouple movements of the engine from those of the wheels
make the interaction between (electrical components) so weak that there is little transfer of energy between them, especially to remove unwanted AC distortion or oscillations in circuits with a common power supply.
2muffle the sound or shock of (a nuclear explosion) by causing it to take place in an underground cavity.
decouple in other Oxford dictionaries
Definition of decouple in the US English dictionary