eating humble pie字面意思是吃了一餐穷人的食物，引申为为了低下的事而屈尊、承认错误、赔罪。

【例句】
We've all done things we need to apologise for, but eating humble pie is a skill in itself.
我们都曾经做过需要道歉的事情，但是屈尊本身也是一种技巧。

You'd better be sure you've got the sales figures right, otherwise you'll be eating humble pie for a long time.
你最好确定没把销售数字弄错，否则很长一段时间内你得低头认罪。