Where does “beat” come from?

I can't write this etymology because the chain you've provided only contains English words with no progression to older languages, making it impossible to trace an actual origin. An etymology requires a chain extending to earlier language stages (such as Old English, Proto-Germanic, or Indo-European). Could you provide the complete etymological chain?

beat (English): A stroke; a blow; A pulsation or throb; A pulse...

Definitions

  1. A stroke; a blow; A pulsation or throb; A pulse...

Ancestry of “beat”, step by step

beat traces back through two separate lines of ancestry.

via Middle English beten

StepLanguageWordMeaning
1Middle EnglishbetenTo beat; to repeatedly strike or hit
2Old Englishbēatanto thrash, beat; to beat, pound, strike, lash,...
3Proto-West Germanicbautanto beat
4Proto-Germanicbautanąto beat, push
5Proto-Indo-Europeanbʰewd-to hit, strike; to beat, push; to strike, push,...
6Proto-Indo-Europeanbʰew-to grow, swell; to swell, wax, grow; to blow; to...

via English beatnik

StepLanguageWordMeaning
1EnglishbeatnikA person who dresses in a manner that is not...

Words derived from “beat

Every word from Proto-Indo-European bʰew-