The phrase "runs by" can be replaced by several synonyms depending on the context of the sentence. Some possible alternatives include "passes by," "goes past," "skims over," "brushes past," "sweeps by," "drifts past," "floats by," and "glides past." Each of these synonyms implies a slightly different image or feeling and can help convey a more specific tone or mood in your writing. For example, "sweeps by" may suggest a sudden or forceful passing, while "floats by" may suggest a gentle or lazy passing. Experimenting with synonyms can help you find the perfect word to convey your intended meaning.