interlock - definition and synonyms

verb [intransitive/transitive] 

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/ˌɪntə(r)ˈlɒk/
present tense
I/you/we/theyinterlock
he/she/itinterlocks
present participleinterlocking
past tenseinterlocked
past participleinterlocked
  1. to join things together by means of parts that fit into other parts, or to be joined together in this way