The phrase "threw a curve" typically means to surprise or trick someone with unexpected and tricky circumstances. Some possible antonyms for this phrase might be "revealed the truth," "played it straight," or "kept things simple." These alternatives imply honesty, transparency, and predictability, rather than the element of surprise or deception. Other antonyms might include "acted predictably," "stayed on course," or "didn't deviate from the plan," all of which have connotations of reliability and consistency. Ultimately, the choice of antonym will depend on the context and specific meaning of the original phrase, as well as the writer's intention and the overall tone of the text.