fall flat on your face

US /fɔl flæt ɑn jʊər feɪs/
UK /fɔl flæt ɑn jʊər feɪs/
"fall flat on your face" picture
1.

gagal sepenuhnya, jatuh tersembam

to fail completely or to be unsuccessful in an embarrassing way

:
His grand plan to impress the boss fell flat on its face.
Rancangan besarnya untuk menarik perhatian bos gagal sepenuhnya.
The comedian's new jokes fell flat on their face with the audience.
Jenaka baru pelawak itu gagal sepenuhnya dengan penonton.