Meaning of “sb's heart/mind/pulse races” in the English Dictionary

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"sb's heart/mind/pulse races" in British English

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sb's heart/mind/pulse races

If your heart/mind/pulse races it works extremely fast because of excitement, drugs, illness, etc.:

She was hot and sweaty and had a racing heart.
A glimpse of his bare torso set my pulse racing.

(Definition of “sb's heart/mind/pulse races” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)