Someone or something that keeps something else safe, protected, or in good condition, like a 'life preserver' in water.
From Old French 'preserver,' combining 'pre-' (before) and 'server' (to serve). Originally meant to protect or guard something from harm before damage could occur.
Life preservers are designed based on Archimedes' principle of buoyancy—they have to displace enough water to hold up your weight. The life preserver became iconic in maritime safety but was invented by accident.
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