To lie is to tell a deliberate falsehood - to say something you know to be untrue. Sometimes this is taken to be acceptable - to tell a "white lie", e.g. in re

To lie is to tell a deliberate falsehood - to say something you know to be untrue. Sometimes this is taken to be acceptable - to tell a "white lie", e.g. in response to, "Does this dress make me look fat?" Saying something incorrect, but which you believe to be true, is no lie.