fall flat
US /fɔl flæt/
UK /fɔl flæt/

1.
失败, 不成功
fail to produce an intended effect; be unsuccessful
:
•
His jokes often fall flat with the audience.
他的笑话常常让观众感到平淡。
•
The marketing campaign seemed to fall flat, as sales did not improve.
营销活动似乎失败了,因为销售额没有改善。