The phrase "be/get lost in the shuffle" implies that someone or something has been overlooked or forgotten in a busy or chaotic situation. There are several synonyms that can be used to convey this meaning, such as "slip through the cracks," "fall by the wayside," "fade into obscurity," "get buried," "be neglected," or "be disregarded." All of these phrases suggest that something or someone did not receive the attention or recognition they deserved due to the overwhelming nature of the situation. It's important to recognize when things or people are getting lost in the shuffle and take measures to prevent it from happening.