The phrase "turn yellow" describe the process where something changes from its original color to a yellow hue. There are various synonyms that can be used to describe the same phenomenon. For instance, the term "yellowing" refers to the gradual process of something changing to a yellow color. Other synonyms include "become jaundiced," "become discolored," "fade," "tarnish," "dull," and "rust." These synonyms can be used in different contexts, such as to describe a flower, a fabric, or even a person's complexion. Regardless of the context, the synonyms provide a range of options for writers and speakers looking to describe something turning yellow.