Sorry, I don't know! As a native speaker I've never heard of this before. Sometimes "by one's teeth" can mean that one did something only just, barely accomplished it, or closely competed something. I think it depends on the TV show's location to understand the meaning.
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Has difficulty understanding even short answers in this language.
Can ask simple questions and can understand simple answers.
Can ask all types of general questions and can understand longer answers.
Can understand long, complex answers.
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