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Webster's 1828 Dictionary

DOUBLE-LOCK

v.t.To shoot the bolt twice; to fasten with double security.

 

Webster's 1913 Dictionary

DOUBLE-LOCK

DOUBLE-LOCK Dou "ble-lock `, v. t.

 

Defn: To lock with two bolts; to fasten with double security. Tatler.

 

New American Oxford Dictionary

double-lock

dou ble-lock ▶verb [ with obj. ] lock (a door ) with two complete turns of the key so as to engage a second bolt. ▶noun (double lock ) a type of lock that may be secured in this way.