double-lock

American  

[duhb-uhl-lok] / ˈdʌb əlˈlɒk /

verb (used with object)

1. to lock with two turns of a key, so that a second bolt is engaged.

2. to fasten with particular care.

---

Etymology

Origin of double-lock

First recorded in 1585–95

Example Sentences

Additionally, “tamper-evident security seals in a double-lock location” would protect machines and votes.

From Washington Times

They are stored under double-lock at hospitals and governed by so-called “red prescriptions,” which only specially certified doctors can write.

From Washington Times

As MIT President L. Rafael Reif has written, “If all we do in response to China’s ambition is to try to double-lock all our doors, I believe we will lock ourselves into mediocrity.”

From Washington Post

The US car giant recommended people double-lock their cars, and store their keys in a "suitable metal box" that will block radio signals.

From BBC

Husted says the machines are kept “under double-lock and key.”

From Washington Times