天花乱坠（天花亂墜）　

◎ 天花乱坠 tiānhuā-luànzhuì

[make a very wild boast about sth. as if it were raining flowers] 亦作“天华乱坠”。佛教传说:佛祖讲经,感动天神,各色香花,纷纷下坠。后以此语形容言谈虚妄、动听而不实在

他总把这个村的工作说得天花乱坠