Swallowed up is often used to describe a situation where something has disappeared or been consumed completely. If we want to use different words to express this idea, we can consider using synonyms such as engulfed, devoured, consumed, ingested, absorbed, or assimilated. Engulfed implies that something has been completely covered or overwhelmed. Devoured suggests a process of eating or destruction. Consumed refers to something being used up or depleted. Ingested can be used when something has been swallowed or taken in through the mouth. Absorbed is often used to describe the process of liquid being absorbed completely. Finally, assimilated implies that something has been fully integrated or absorbed into something else.