fall flat on one's face

fall (flat) on one’s face (be completely unsuccessful at a task, fail to achieve a desired effect; || fail or make a mistake in an embarrassing way; make a blunder or error of judgment) — потерпеть фиаско, неудачу, с треском провалиться; облажаться, лажануться; выставить себя дураком

Example 1: That weatherman keeps falling flat on his face with his predictions. (answers.com)

Example 2: The new scheme / plan / project fell flat on its face in spite of all the financial support that was given.

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This term, first recorded in 1614, originally had the literal meaning of "prostrate oneself in reverence." The present colloquial usage, however, transfers a physical fall to various kinds of bungling. (answers.com)

see also
[опростоволоситься]
[потерпеть фиаско]

[put one's foot in it]
[egg on one's face]
goof up
slip up
mess up
screw up