炫耀用英语可以说是 boast。来源：boast 的词根是古英语中的 bost，意思是壮举或喜事。

例句：

He boasted about his new car to all of his friends.（他向他所有的朋友炫耀他的新车。）

She boasts about her perfect grades, but I know she cheated on the test.（她吹嘘她完美的成绩，但我知道她在考试中作弊。）