Noun
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an animating or vital unifying force
"New York is the commercial heartbeat of America"
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a very short time (as the time it takes the eye to blink or the heart to beat)
"if I had the chance I'd do it in a flash"
- blink of an eye - split second - new york minute -
the rhythmic contraction and expansion of the arteries with each beat of the heart
"he could feel the beat of her heart"