牛皮 niúpí boasting Origin Definitions Defs Strokes Stroke Words Sentences Sents Showing: tough All meanings 3 niúpí 3 boasting 1cowhide 1tough 1 1 sentence for 牛皮 (niúpí — tough) 这种纸很牛皮，怎么撕都撕不烂。 zhè zhǒng zhǐ hěn niúpí, zěnme sī dōu sī bù làn. This paper is very tough; it won't tear no matter how you pull it. Source: Dong Chinese Dictionary