Hexagram 49 has left a mark on modern Chinese that no other hexagram has, and the etymology is worth setting out.
The name is Ge. Its root sense is an animal hide, specifically a hide that has been stripped and prepared, and by extension the shedding or changing of a skin. From that comes the sense of thoroughgoing change, of a thing replaced rather than adjusted. The compound geming, which pairs this character with the word for mandate or decree, means the changing of the mandate: the removal of a ruler's authority to rule. It is the standard modern Chinese word for revolution, and it comes from this conceptual family.
That is not a coincidence retrofitted onto the hexagram. The Zhou dynasty's own legitimating story was that the mandate of heaven had passed from the Shang to them, and the text was compiled by people for whom the overthrow of a dynasty was recent political history rather than theory.
Wilhelm gives Revolution, with Moulting as an alternative, and both are right. Legge uses Change. Later translations sometimes give Skinning or Hide, keeping the physical image.
The judgement says that on one's own day one is believed, that the change is credited only when its time has fully come, and the line texts include the tiger and the panther changing their markings, and the inferior person changing only his face. That last distinction, between a real change and a cosmetic one, is the hexagram's sharpest observation, and it is made in the vocabulary of animal pelts rather than of ethics.