Third-person singular present tense of 'ensue'—follows as a result or consequence.
From 'ensue', which comes from Old French 'ensuir' and Latin 'sequi' meaning to follow. The '-s' is the standard English verb agreement marker for third person singular.
This humble present-tense form connects us to Latin through centuries of language evolution—every time someone writes 'chaos ensues,' they're using a verb whose root goes back to the Roman concept of following one thing with another.
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