Webster's English Dictionary

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interlock

in.ter.lock \.int-*r-'la:k\ \'int-*r-.la:k\ \.int-*r-'la:k-*r\ vi : to 
   become engaged or interrelated with one another  1: to lock together : 
   UNITE  2: to connect so that motion of any part is constrained by another; 
   esp  : to arrange the connections of (as railroad signals) to ensure 
   movement in proper sequence - in.ter.lock n