The pulse or rhythm of blood flowing through the body; sometimes used poetically for heartbeat.
Compound of 'blood' and 'beat' (pulse/rhythm). This is primarily a poetic or archaic term rather than standard medical vocabulary.
Your bloodbeat is literally keeping you alive right now—a pulse so constant you forget about it until you feel your wrist and suddenly remember: 60-100 times per minute, every minute of your life.
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