Etymology
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interlock (v.)

1630s, "to be locked together," from inter- "between" + lock (v.). Related: Interlocked; interlocking. As a noun, attested by 1856.

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Definitions of interlock
1
interlock (v.)
coordinate in such a way that all parts work together effectively;
Synonyms: mesh
interlock (v.)
hold in a locking position;
Synonyms: lock / interlace
interlock (v.)
become engaged or intermeshed with one another;
Synonyms: lock
2
interlock (n.)
a device that prevents an automotive engine from starting;
car theives know how to bypass the ignition interlock
Synonyms: ignition interlock
interlock (n.)
the act of interlocking or meshing;
an interlocking of arms by the police held the crowd in check
Synonyms: mesh / meshing / interlocking
From wordnet.princeton.edu