pratfall
/ˈprætfɔːl/noun
1- informal a fall on to one's buttocks〈非正式〉（屁股着地的）坐跌; 屁股墩：
she took a pratfall into a dessert trolley.
她一屁股跌坐在甜点车上。
1.1
- a stupid and humiliating action愚蠢丢人的失误：
the first political pratfalls of the new administration.
头几个令新政府蒙羞的政治失误。