The phrase "set a figure" implies establishing a value or an amount. Its antonyms include words like avoid, disregard, neglect, and shun. These words indicate a deliberate attempt to ignore or reject the establishment of a specific value or amount. Other antonyms for "set a figure" include the verbs decrease, lower and reduce, which convey the idea of diminishing or lowering an already-established value. In some contexts, antonyms for "set a figure" might include words like guess, estimate, or approximate, which suggest that a precise value has not been established. Regardless of the context, it is always useful to have a variety of antonyms at hand to express a range of subtly different meanings.