On the Polymarket interface, here's how it looks:
The first step to resolving a market is to propose a resolution.
Once submitted, the proposal enters a 2-hour dispute window. During this time, anyone can dispute the proposed outcome.
If the proposal goes unchallenged during the dispute window, it is accepted, and the market resolves accordingly.
If the proposal is disputed, it proceeds to a discussion and vote. In the meantime, another proposal can be submitted.