in·ter·lock 
(ĭn′tər-lŏk)
(ĭn′tər-lŏk)v. in·ter·locked, in·ter·lock·ing, in·ter·locks
v.tr.
1. To unite or join closely as by hooking or dovetailing.
2. To connect together (parts of a mechanism, for example) so that the individual parts affect each other in motion or operation.
v.intr.
To become united or joined closely, as by hooking or dovetailing.
n. (ĭntər-lŏk′)
1. A mechanical device that prevents a component from functioning when another component is functioning or situated in a particular way.
2. A stretchy fabric knitted with interlocking stitches by alternating sets of needles on a circular knitting machine.