The phrase "is expressed by" is commonly used when talking about communication or conveying a certain message. However, there are several synonyms that can be used in its place to add variety and prevent repetition in writing or speech. Some examples include "is articulated by," "is conveyed through," "is depicted by," "is manifested in," and "is represented by." Each of these phrases offers a slightly different nuance in meaning and can be used depending on the specific context and tone of the communication. By using synonyms for "is expressed by," writers and speakers can enhance their language and communicate their message more effectively.