What is another word for first line of defense?
Pronunciation: [fˈɜːst lˈa͡ɪn ɒv dɪfˈɛns] (IPA) 
The term "first line of defense" refers to the initial protective measures taken to prevent or deter an attack or invasion. Synonyms for this phrase could include "primary defense," "frontline defense," "initial line of protection," "front line security," "initial security barrier," "first level of defense," or "initial defensive step." These synonyms are all interchangeable with the original phrase and can be used to convey the same meaning in various contexts. As the first line of defense is a critical factor in ensuring safety and security, it is essential to utilize the most effective measures available to prevent and mitigate any potential risks or threats.
