吹牛 (chuī niú): to talk big; to brag; to shoot off one's mouth; (dialect) to chat idly

He always talks big about knowing many celebrities, but last time we ran into an actor on the street, he couldn't even remember the person's name.

During the interview, he boasted that he had five years of work experience, but when the HR manager called to check, they found out he had only worked in the relevant industry for half a year.

Don't listen to Xiao Wang's bragging; he says he can drink ten bottles of beer without getting drunk, but actually at the last party he started talking nonsense after just two bottles.

She often brags on social media, showing off various designer bags, but later everyone found out that she had borrowed them just for photos.

That salesman boasted that their product could cure all diseases, but customers complained to the consumers' association, and the company had to apologize publicly.