"Cried river" is a poetic way of describing someone who has shed an excessive amount of tears. There are several other synonyms for this phrase, such as "weeping stream" or "sobbing brook." The use of a metaphorical phrase to describe the act of crying is a common literary technique used in both poetry and prose. Other examples of such phrases include "flooded with tears," "sorrowful rain," and "tearful torrent." No matter the phrasing, the sentiment remains the same - a deep expression of profound sadness and emotional pain.