What is the meaning of “my mouth was lined with sheepskin” mean

Definition of “my mouth was lined with sheepskin” mean? Could it mean that the mouth was dry? What is it to do with sheepskin? Thank you
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What does the Chinese idiom 吃不了兜着走 mean? How do you

The Project Gutenberg eBook of The Great White Hand, by J. E. Muddock.