Lock
Lock noun - One that is certain to succeed.
Safety
Safety noun - A protective device (as on a weapon) to prevent accidental operation.
Usage example: the gun couldn't be fired as long as the safety was on
How words are described
Both words in one sentence
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Then, just as Matilda is about to catch up with Nigel, the Deinosuchus lunges out of the water at Matilda, barely missing, giving Nigel enough time to reach safety and lock Matilda into a paddock.
Source: Series / Prehistoric Park -
Holodecks just aren't fun unless they periodically lock people inside and turn off safety protocols.
Source: Holodeck Malfunction -
Example: in the first game, taking a criminal to jail requires you to lock up your gun in a gun locker outside, for safety.
Source: Stop, or I Will Shoot!
Cite this Source
Safety and Lock. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/lock/safety
Lock & Safety. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/lock/safety>.
Safety or Lock. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/lock/safety.
Google Ngram Viewer shows how "lock" and "safety" have occurred on timeline