To deliberately discredit oneself or feign unworthiness to avoid an unwanted official appointment, duty, or responsibility; to falsely incriminate oneself for a specific purpose.
他不想担任那个吃力不讨好的职务，只好高凤自秽，谎称自己身体不适，难以胜任。
He didn't want to take on that thankless position, so he had to resort to "Gao Feng's self-defilement," falsely claiming to be unwell and incapable of the task.
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