吃哑巴亏

词典解释

[be cheated or suffer a loss but unable to talk about it for one reason or another] 吃亏上当了又不能言明,也叫“吃闷亏”

成语解释

自己遭受暗算或受损吃亏，不敢声张或无法申诉，只好自认吃亏。