The verb belie means to hide the truth and give a false representation about something.  

Synonyms are contradict, misrepresent, conceal, or distort.

The word origins from Old English beleogan meaning “to deceive by lies” from be- plus lie meaning “to lie, tell lies”. Current sense of “to contradict as a lie, give the lie to, show to be false” and is first recorded in the 1640s. 

The policeman needed to belie in order for the operation not to be disturbed.

I don’t understand why she always belies and tricks us, as we’ve always been good to her.

He belied and got caught so he tried to defend his act. But white lies or not, lies are still lies.