To move somewhere in large numbers, often in a busy or chaotic manner. Tourists swarmed the beach as soon as the sun came out.
To be filled or crowded with a large number of moving individuals. The garden swarmed with bees collecting nectar from the flowers.
To climb or move quickly and energetically. The children swarmed up the hill to get a better view of the parade.
(of bees) To leave a hive in a mass in order to establish a new colony elsewhere. The honeybees swarmed in late spring, settling on a nearby apple tree.