The phrase "swarm with" typically means a large number of something moving or gathering together. Some synonyms for "swarm with" include "teem with," "abound with," "overflow with," "throng with," and "flood with." Each of these synonyms conveys a similar sense of an overwhelming abundance of something. For example, if a garden is "teeming with" flowers, it suggests that the garden is alive with color and fragrance. Likewise, if a city street is "thronging with" tourists, it implies that the bustling energy and activity are palpable. Whether you use "swarm with" or any of its synonyms, the message is clear: there is a lot of something in one place.