Antonyms for "twist and turn" would include words that denote smooth, linear movements. Some of these words might include "coast," "glide," "slide," "flow," "stream," "direct," "straighten," or "extend." These words suggest a sense of ease and continuity, rather than the jagged, unpredictable motion associated with "twist and turn." Using these antonyms can help to convey a sense of calm, clarity, or simplicity in your writing, depending on the context. Choosing the right antonym for your purpose can help you to create a specific mood or tone in your work, and make it easier for readers to understand the message you are trying to convey.