The phrase "were swallowed up" can be replaced with a variety of synonyms to convey different emotions and contexts. For instance, "were engulfed" might imply a sudden and overwhelming force, while "were devoured" suggests a predatory or uncontrollable situation. "Were consumed" might evoke a sense of gradual disappearance or transformation, while "were absorbed" implies absorption into a larger entity or idea. "Were eclipsed" can suggest a overshadowing or overshadowing scenario, while "were overcome" conjures up a notion of defeat or failure. Each synonym provides a distinct nuance and conveys a unique connotation, offering a wider range of language choices and ways to express yourself.