"吹牛( chuīniú)" means to talk but ignore the facts. In order to make him/her important, the speaker usually tells others his/her made-up high social status, strong points and abilities. We can also describe this behavior as "吹牛皮". "吹牛( chuīniú)" can also be used independently as a response to other's statement, which suggests the speaker does not believe what the other said, and think he/she was just bragging.
例句 Sentences
1、他总是爱吹牛,都没人相信他了。 Tā zǒngshì ài chuīniú, dōu méirén xiāngxìn tā le. He is always talking big, so no one trusts him anymore.
2、他吹牛说他这次考试肯定能考满分。 Tā chuīniú shuō tā zhècì kǎoshì kěndìng néng kǎo mǎnfēn. He brags that he will get full marks in this exam.