Definition of safety lock in English:

safety lock

Syllabification: safe·ty lock

Entry from US English dictionary

(also safety catch)

noun

A device that prevents a gun from being fired or a machine from being operated accidentally.

Definition of safety lock in:

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Word of the day hypnopompic
Pronunciation: ˌhɪpnə(ʊ)ˈpɒmpɪk
adjective
relating to the state immediately preceding waking up