What is the meaning of interlock?

noun

• A device that prevents an automotive engine from starting.
  • usage: "car theives know how to bypass the ignition interlock"
  • synonyms: ignition interlock
• The act of interlocking or meshing.
  • usage: "an interlocking of arms by the police held the crowd in check"
  • synonyms: mesh, meshing, interlocking

verb

• Coordinate in such a way that all parts work together effectively.
  • synonyms: mesh
• Hold in a locking position.
  • usage: "He locked his hands around her neck"
  • synonyms: lock, interlace
• Become engaged or intermeshed with one another.
  • usage: "They were locked in embrace"
  • synonyms: lock