Suffocate
Definition 1 of 3
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Physical Danger
Used to express a life-threatening situation due to lack of air. Many animals suffocate if trapped underwater for too long.
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Metaphorically Speaking
Sometimes used metaphorically to describe an overwhelming feeling. He felt suffocated by his responsibilities.
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Intensity Emphasis
Highlights extreme conditions that make breathing difficult. The smoke was so thick, I thought I'd suffocate.