A deliberate, untrue statement which does no harm or is intended to produce a favorable result
An occasional little white lie such as Weston's probably won't cause any lasting damage. And at times, telling the truth—particularly the whole truth to a child who's not at an age to handle it—may do more harm than good, they say.
If you refer to an untrue statement as a white lie, you mean that it is made to avoid hurting someone's feelings or to avoid trouble, and not for an evil purpose. An often trivial, diplomatic or well-intentioned untruth. a lie that you tell someone in order to protect them or avoid hurting their feelings