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1. A sudden disruption in the heart's normal functioning, as due to an obstructed coronary artery. Dad's heart attack laid him out for nearly a month. We're lucky he survived! I'm worried that she's going to have a heart attack from the amount of stress she's been under at work lately.
2. By extension, a particularly frightening, jarring, or anxious experience. Josh just about gave me a heart attack when he jumped out of the closet. I almost had a heart attack when I saw that car coming at me.
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