n.威吓；唬人
动词bluff的现在分词形式.
He says he'll win the race, but he's only bluffing. 他说他会赢得这场比赛，事实上只是在吹牛。
I don't believe he'd really do what he threatens he's only bluffing (us). 我不相信他真会按他威胁的话去做，他不过吓唬(我们)罢了。
