fall flat on your face

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

فشل فشلاً ذريعاً, سقط على وجهه

to fail completely or to be unsuccessful in an embarrassing way

:
His grand plan to impress the boss fell flat on its face.
خطته الكبرى لإبهار الرئيس فشلت فشلاً ذريعاً.
The comedian's new jokes fell flat on their face with the audience.
نكات الكوميدي الجديدة فشلت فشلاً ذريعاً مع الجمهور.