the.com/beating

means A repeated rhythmic striking or pulsing — whether a heart's steady thump, a drum's pulse, or the physical act of hitting something again and again.

from From Old English 'beatan,' meaning to strike or pound — a word so old it shares ancient Germanic roots with 'batter' and 'butt.' The core sense has always been physical impact, repeated: fists on a door, waves on rock, a pulse against the wall of a chest. The heart's version is just the oldest beating going, borrowed into language because nothing hits harder, or proves more, than that.