Safeguard
Definition 1 of 3
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Physical Safety
Safeguard in the context of physical safety implies prevention of actual harm to people or property. Fire extinguishers are placed as a safeguard in the event of a fire.
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Metaphorical Use
Safeguard can be used metaphorically to talk about protecting abstract things like interests or rights. Free speech is a safeguard of democracy.
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Common Collocations
Note common phrases like 'safeguard against' to show what you're protecting from or 'implement safeguards' for introducing protections. Companies must implement safeguards against data breaches.