虎落平川　

◎ 虎落平川 hǔluò-píngchuān

[a man who loses position and influence may be subjected to much indignity] 老虎從山里來到平地。比喻有勢力者失去了依仗或人遇到了倒霉的時候

虎落平川被犬欺。——清· 錢彩《說岳全傳》