knock the stuffing out of (one)
1. To strike or assault one violently and severely. Likened to the cotton stuffing of a stuffed animal being knocked out of it by severe blows. Hey, watch it, pal, or I'll knock the stuffing out of you! Two guys mugged me and then knocked the stuffing out of me last night.
2. To lower one's confidence. Boy, that performance review really knocked the stuffing out of me—I just feel like I can't do anything right anymore.
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