Definition of "Interlock" :

noun: the act of interlocking or meshing

"An interlocking of arms by the police held the crowd in check."

noun: a device that prevents an automotive engine from starting

"Car theives know how to bypass the ignition interlock."

verb: coordinate in such a way that all parts work together effectively

verb: become engaged or intermeshed with one another

verb: hold in a locking position