fail miserably
Definitions
To experience a complete and total lack of success in an endeavor.
To perform or execute a task with catastrophic or embarrassing results.
Examples
Despite weeks of preparation, the team managed to fail miserably during the final presentation.
The new marketing campaign was so poorly executed that it was destined to fail miserably from the start.
Synonyms
crash and burn flop bomb fizzle out go down in flames strike out come a cropper
Antonyms
succeed brilliantly thrive hit a home run triumph excel flourish hit the mark