noun
a protective device worn on the face, typically used in medical or industrial settings to protect the eyes, nose, and mouth from splashes, debris, or other hazards
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The laboratory technician wore a face shield to protect against any chemical splashes.
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Make sure to put on your face shield before using the power tools.
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I feel like a superhero when I have my face shield on.
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She put up a metaphorical face shield to block out all the negativity around her.