Fall away is a commonly used phrasal verb that refers to the process of losing interest, losing connection, or diminishing in size or importance. In literary language, the word is used to signify the decline of a character or situation. However, there are plenty of synonyms for "fall away" that can be used based on the context. Some of the synonyms for "fall away" include decline, shrink, dwindle, lessen, weaken, fade, deteriorate, recede, wane, diminish, and ebb away. All these words refer to the same action or process but can be used to evoke different nuances and shades of meaning, which make them highly useful in writing and communication.