noun
a solid piece of hard material, especially rock, stone, or wood
verb
to cover or obscure something, usually with a physical barrier or by mentally disregarding it
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The curtains in the conference room are designed to block out natural light during presentations.
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I always wear sunglasses to block out the sun when I'm at the beach.
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I need to block out all the noise from my siblings when I'm trying to study.
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It's important to block out negative thoughts and focus on the positive aspects of life.