- to lock with two turns of a key, so that a second bolt is engaged.
- to fasten with particular care.
Origin of double-lock
First recorded in 1585–95
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for double-lock
Then he left the closet, taking care to double-lock the door.The Exploits of Juve
Pierre Souvestre and Marcel Allain
And with that she blew him a kiss from the threshold of her bedroom, and Rudolf heard her double-lock the door behind her.A Hungarian Nabob
You will be at liberty to double-lock my study door; you can go to sleep without the slightest fear.My Neighbor Raymond (Novels of Paul de Kock Volume XI)
Charles Paul de Kock
The single-lock and double-lock bridges with two and three spans of 15 ft., respectively, are the ones of most utility.Manual of Military Training
James A. Moss
I got up, with a shiver, to shut and double-lock it; then I made for the alcove, and went to bed in haste.An "Attic" Philosopher, Complete