The phrase "string something out" usually means to prolong or extend something, often needlessly or in a tedious manner. Antonyms for this phrase would thus be words that convey the opposite meaning, such as shorten, compress, hasten, or expedite. These words suggest efficiency, brevity, and a sense of urgency or acceleration, which stand in direct contrast to the process of stringing something out. Other possible antonyms may include words such as streamline, simplify, condense, or abbreviate, all of which imply a desire to reduce waste, minimize clutter, and maximize productivity. Using these antonyms can help improve communication and avoid confusion when discussing different methods or approaches to achieving a specific goal.