Said Enough! - idiomatic expression

What does this idiomatic expression mean? Read the excerpt from the Spanish newspaper AS and understand it in context.

"They told Neymar that 2025 was over for him. His knee said enough; his head didn't. Despite the negative opinion from Santos' medical department, the star didn't miss this final stretch of the season, and thankfully so. Against Juventude, he played his best match since returning to Vila Belmiro. A demonstration of character to put his foot down. Practically everything was at stake. When Santos needed him most, the Brazilian star came to the rescue of the club of his life," the newspaper continued.

‍"His knee said enough" means that Neymar's knee injury had reached its limit, signaling it could no longer endure the physical demands of playing.

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This idiomatic expression personifies the knee as having "said enough," implying the injury was severe enough—such as a meniscus tear—to warrant stopping activity and seeking medical intervention like surgery. Despite Santos' medical department advising rest, Neymar pushed through the pain, highlighting his determination over the knee's warning. This context fits reports of his knee discomfort before key matches, yet he played to aid Santos' fight against relegation.