Poor Kathy fell flat on her face in the mud. 可怜的凯茜脸朝下跌进了泥里。
How does he drink so much and not fall flat on his face?
She tripped over a ball and fell flat on her face.
If you've ever fallen flat on your face, you know how embarrassing it can be.
I once fell flat on my face while chasing a guy who had stolen my camera.
See also: fall verb (HAVE AN ACCIDENT)