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This question already has an answer here:

I've encountered the phrases "lying through his teeth" and "lying". Both have been used in similar contexts to (at least what I understand) as similar definitions. What is the meaning of the idiom of "to lie through one's teeth" and how is this different from just regular lying? Does lying through your teeth mean you lie while smiling?

Related, but not a duplicate. The answer there only tells the difference between "lying through his teeth vs lying in his teeth". My question is unique because I am asking about the difference in the usage of lying through his teeth vs lying in similar context, while the related question only addresses the origin of the phrase.

marked as duplicate by anongoodnurse, user140086, Drew, choster, Nathaniel Feb 17 '16 at 20:20

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • It's basically just more egregious. – Hot Licks Feb 17 '16 at 1:14
  • Yes, it's related, but it also gives the answer you're looking for. – anongoodnurse Feb 17 '16 at 1:24
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    Perhaps one can tell that he's lying because his lips are moving? – Rob_Ster Feb 17 '16 at 3:39
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In my experience, lying through the teeth is used mostly when salesmen (or others) tell big or frequent lies, hoping to prey on the naivety of the other party.

TheFreeDicionary.com defines it in many ways, including:

"to lie boldly",

"to say things that are not true in a way that seems sincere",

"to tell someone something that you know is completely false",

"to lie outrageously or brazenly."

Wiktionary defines it as:

"To tell a gross or egregious untruth."

Dictionary.com defines it as:

"to lie grossly or maliciously"

That seems pretty inconsitent to me, so I would just try to use it the way other people seem to be using it around me, and I might even start asking them what the mean by it.

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    It refers to lying while exposing your teeth as in when you are smiling. Like when a saleman smiles his big beguiling smile while lying to you about his product. – Jim Feb 17 '16 at 2:23
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    Interesting. I found a source that does say this idiom suggests a lie that sounds sincere - as when a person is smiling. However, I think it is usually used for simple emphasis; a person who tells an audacious lie or who lies repeatedly can be said to be lying though his teeth. At least, that's the way I've always interpreted it. – David Blomstrom Feb 17 '16 at 2:28
  • @DavidBlomstrom you should post that as an answer – fi12 Feb 17 '16 at 3:44

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