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means The act of undermining an established system, authority, or set of beliefs from within, rather than attacking it head-on from outside.

from From Latin subvertere — 'sub' (under) plus 'vertere' (to turn) — literally 'to turn from underneath,' the same way you'd overturn a cart by upending it from below rather than pushing it over. It passed through Old French into English by the 1300s, originally carrying a sense of ruin or overthrow of institutions, laws, or morals before narrowing toward its modern flavor of covert, inside-out sabotage.