To make sober; to reduce the alcohol content of a substance, or to calm and make serious in tone or demeanor.
From Spanish/Portuguese 'assoberbarse' or from French 'rassasier,' influenced by prefix 'as-' (meaning 'to make') plus 'sober,' creating a verb meaning 'to make sober.'
This is an incredibly rare English word—so rare that modern dictionaries barely include it—which shows how languages constantly lose words they don't use anymore, like ships sailing out of linguistic harbors forever.
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