noun
a type of tight-fitting shirt made of a stretchy and quick-drying material, typically worn for protection while participating in water sports or other activities
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The rash guard is designed to protect the skin from rashes and sunburn while engaging in water sports.
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I always wear a rash guard when I go surfing to avoid getting a sunburn.
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Dude, don't forget your rash guard if you're hitting the waves today.
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Wearing a rash guard can be seen as a form of self-care, protecting oneself from harm.