The term "redline" typically refers to the practice of drawing a red line to indicate a boundary or limit. Antonyms for the word would include words like "expand," "stretch," or "enlarge," which suggest broadening or extending beyond a previously established limit. Other opposite words include "remove," "erase," "negate," or "eliminate," all of which suggest the act of reducing or taking away a prior boundary or limit. "Open," "unrestricted," and "unlimited" are also possible antonyms, signaling a lack of limitations or boundaries entirely. Overall, the antonyms for "redline" suggest an openness, lack of limitations, or expansion beyond previously established boundaries.