Third person singular present tense of bethump; he, she, or it beats or strikes repeatedly.
The standard '-s' conjugation added to 'bethump' for third person singular verbs in present tense. This follows basic English verb conjugation rules established in Old English.
English dropped most verb conjugations (unlike French or Spanish), but we kept this one '-s' ending. It survives because it's so quick and light that it hardly feels like extra work, while the heavier endings didn't survive the simplification of Middle English.
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