Past tense of belie: to contradict or show something to be false, or to fail to give a true impression of something.
From Middle English belien, from be- + lie (Old English leogan). Originally meant 'to tell lies about,' but evolved to mean 'to contradict' or 'to give a false impression.'
The word 'belie' cleverly combines the prefix 'be-' (make) with 'lie,' so you're literally 'making a lie'—but it became so sophisticated that it means the subtle way something can look one way while being another, like a calm face that belies inner rage.
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