There are several different synonyms for the phrase "fall farther behind." Some examples include "lag behind," "trail behind," "lose ground," "fall back," and "slip further behind." These phrases all describe a similar situation in which someone or something is experiencing a decrease in progress or success relative to others. Whether you are talking about an individual trying to keep up with a group or a business struggling to compete in a crowded market, using these synonyms can help to convey a sense of urgency and the need to take action in order to catch up.