"Dialling back" is often used to describe the act of reducing or decreasing something. However, there are several antonyms that can be used to express the opposite meaning. One antonym for "dialling back" is "ramping up," which implies an increase in intensity, volume or speed. "Intensifying" is also an antonym for "dialling back," which means to make something more intense or severe. Another antonym would be "escalating," which implies a gradual increase or rise in something. Lastly, "augmenting" is also an antonym for dialling back, which implies increasing the size or amount of something. In conclusion, by using antonyms for "dialling back," we can express the opposite meaning that entails an increase or expansion of something.