noun
a dome-shaped muscular partition separating the thorax from the abdomen in mammals; it plays a major role in breathing
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The diaphragm is a dome-shaped muscle that plays a crucial role in the breathing process.
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I felt a sharp pain in my diaphragm after laughing too hard.
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I need to work on my diaphragm strength for better singing.
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His laughter was so contagious, it felt like my diaphragm was getting a workout.