"Sending river" is not a commonly used phrase in the English language, and as such, it does not have antonyms. However, we can break down the phrase into its individual words - "sending" and "river" - and find antonyms for each. For "sending," antonyms include "receiving," "withholding," or "keeping." For "river," antonyms include "land," "dryness," or "aridity." While these antonyms may not relate directly to the phrase "sending river," understanding the opposite meanings of individual words can enhance our ability to express ourselves effectively in language.