A safeguard is a defense or precaution. You could describe a flu shot as a safeguard against getting sick, for example.

Safeguards protect against something negative, whether it's an attacking army invading a country or a boy you don't like much asking you to the prom. A store's security system is a safeguard against theft, and a secret password is a safeguard against your sister reading your email. You can use it as a verb too: "We clearly need to safeguard our Halloween candy so Mom and Dad don't steal it after we go to bed."

Definitions of safeguard

n a precautionary measure warding off impending danger or damage or injury etc.

“an insurance policy is a good safeguard
guard, precaution
a precaution in case of an emergency
security, security measures
measures taken as a precaution against theft or espionage or sabotage etc.
Type of:
measure, step
any maneuver made as part of progress toward a goal

n a document or escort providing safe passage through a region especially in time of war

Type of:
pass, passport
any authorization to pass or go somewhere

v make safe

Type of:
shield from danger, injury, destruction, or damage

v escort safely

Type of:
accompany as an escort

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