the earth/ground/floor opens idiom
（指尴尬得希望）地面裂开（使自己消失）
You say that you wish the earth/floor/ground would open (up) if you are so embarrassed that you want suddenly to disappear.
At that moment the boss walked in, and I just wanted the ground to open up and swallow me. 正在那时老板走了进来，我只希望地上裂条缝让我钻进去。