Not Until (直到...才)

直到...才 is used to express that something does not happen until a specific time or condition is met. 直到 marks the endpoint — a time, event, or condition — and 才 emphasizes that the action in the main clause only happens at that late point. The overall feeling is that the action was delayed or came later than expected.

It is important to distinguish this from 直到...都, which means something continues all the way until a point. With 才, the emphasis is on the lateness of the new action starting; with 都, the emphasis is on the persistence of an ongoing state.

The subject of the 才 clause can appear before 直到 or between 直到 and 才. In casual speech, 直到 is sometimes shortened to just 到. This pattern is very common in narrative writing to create a sense of dramatic timing.