interlock

(noun) a device that prevents an automotive engine from starting. Synonyms: ignition interlock. Example: "Car theives know how to bypass the ignition interlock."

(noun) the act of interlocking or meshing. Synonyms: mesh, meshing, interlocking. Example: "An interlocking of arms by the police held the crowd in check."

(verb) coordinate in such a way that all parts work together effectively. Synonyms: mesh.

(verb) hold in a locking position. Synonyms: lock, interlace. Example: "He locked his hands around her neck."

(verb) become engaged or intermeshed with one another. Synonyms: lock. Example: "They were locked in embrace."