The phrase "falls farther behind" can be replaced with a variety of synonyms to express the idea of falling behind in a competitive or comparative sense. Examples of synonyms include "lags further behind", "loses more ground", "trails even further", "slides further down", "slips further away", "remains further behind", "descends further behind", "drifts further away", "loses more traction", and "recedes further back". All of these synonyms convey the meaning of being left behind in a race, competition, or comparison, and emphasize the idea of a diminishing gap or distance between oneself and others or a goal.