means An open, organized uprising against an established government or authority — a revolt that goes beyond protest into outright defiance of power.

from From Latin insurgere, "to rise up," built from in- ("upon, against") plus surgere ("to rise") — the same surgere that gives us surge and resurrection. The Latin noun insurrectio carried the literal sense of "a rising up," and it came into English through Old French insurrection in the late medieval period. So the word is, at root, simply people getting to their feet against those above them — the menace lives in the direction they're facing.