tr.v. be·lied, be·ly·ing, be·lies
1. To give a false representation to; misrepresent: "He spoke roughly in order to belie his air of gentility" (James Joyce).
2. To show to be false; contradict: Their laughter belied their outward grief.
[Middle English bilien, from Old English belēogan, to deceive with lies; see leugh- in the Appendix of Indo-European roots.]
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