exposure of sb’s ulterior motives; penetrating (/cutting) criticism ? 聽(tīng)到這種～，他惱羞成怒。On hearing the penetrating criticism,he flew into a rage from shame.
誅心之論zhū xīn zhī lùn
誅心：譴責(zé)要害。指批評(píng)人擊中了要害。penetrating criticism, exposure of sb.’s ulterior motives