To make into a monster; to represent or describe as monstrous or evil.
From 'be-' (prefix making or causing) + 'monster' (from Latin 'monstrum', meaning omen or marvel). The verb form means to transform something into a monster.
Shakespeare and his contemporaries loved creating verbs from nouns this way—'bemonster' was part of a creative explosion where Renaissance writers could turn almost any noun into a verb, making language incredibly flexible and expressive.
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