Beating or pulsing with a steady, rhythmic motion, usually describing pain or a heartbeat.
From Old English 'throbbian' with uncertain origin, though possibly imitative of the sound/feeling of a heartbeat; the word is thought to echo the actual pulsing sensation.
The word 'throbbing' is beautifully onomatopoetic—when you say it, the double 'b' and the 'th' sound actually mimic the sensation of your heart beating, so the word itself throbs!
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