Aggression turned inward occupies a contested but structurally central position across the depth-psychology corpus. Freud’s foundational architecture in ‘Civilization and Its Discontents’ establishes the mechanism with clinical precision: the ego, rendered masochistic under the sadistic super-ego, conscripts the death instinct against itself, generating guilt, self-punishment, and the need for suffering. Klein extends this architecture, distinguishing the fate of the death instinct retained within the ego — where it energizes aggression against the persecutory internal object — from the portion projected outward. Horney displaces the metapsychological frame entirely, relocating the phenomenon in neurotic pride economics: self-hate, once it cannot safely discharge outward, circles back as self-torture, psychosomatic conversion, or the elaborate theater of feeling victimized. Levine grounds the concept somatically, arguing that the suppression of outward-directed rage in traumatized individuals requires massive energic expenditure and produces debilitating shame, exhaustion, and the festering of traumatic states. Heller and the developmental-trauma tradition emphasize how early relational helplessness forecloses protest and anger, forcing aggressive charge into dissociation and depression. Berry reads the mechanism archetypal-mythologically, mapping Freud’s internalized aggression onto the Demeter/Persephone configuration. Hollis situates the dynamic specifically in male wounding: depression as anger turned inward, illness as its somatic residue. The term thus functions as a hinge concept linking drive theory, affect regulation, somatic trauma, neurotic character structure, and archetypal psychology.