The phrase "major shake" typically refers to a significant or large-scale change, shift, or disturbance in a situation or circumstance. Full definition
Pretty well everyone agreed that the legal profession was in for a pretty major shake up in any event simply from the impact of technological change, let alone regulatory requirements (and Brexit). (law-tech-a2j.org)
The NBA has already seen major shake - up with the Jimmy Butler trade to the Timberwolves on draft night, Chris Paul to the Rockets, and the stunning Paul George to Oklahoma City trade on the night before free agency. (sbnation.com)
Team Fortress 2 is in for a pretty major shake - up, comprised of the «Campaign 3», update, the Pyro class pack, and the Jungle art theme, according... (pcgamesn.com)