Present participle of 'belie,' meaning to contradict, give a false impression of, or fail to give a true representation of something.
From Middle English 'belien,' from Old English 'be-' (prefix) plus 'leogan' (to lie/deceive). The meaning evolved from 'to lie about' to 'to contradict or give false impression of.'
Belie' is one of the few 'be-' prefix verbs that survived and thrived—it's used constantly in sophisticated writing to mean 'that appearance contradicts reality,' making it perfect for plot twists.
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