Rubifies is a verb that is used to describe the process of turning red or reddish in color. Synonyms for rubifies might include terms like blush, flush, or redden. These words all describe the process of skin or other surfaces turning red in response to various stimuli, like embarrassment, exertion, or simply exposure to heat or sunlight. Other possible synonyms for rubifies might include words like tint, color, or stain, which suggest a more permanent change in hue rather than a temporary flush of color. Whatever word you choose, the idea is to capture the sense of a surface taking on a reddish or ruddy hue.