Roll in is a phrase commonly used to describe something or someone arriving in large numbers or abundance. Some synonyms for roll in include pour in, flood in, swarm in, stream in, and flock in. These phrases can be used interchangeably to describe an influx of people or objects. For example, "customers poured in during the sale" or "the bees swarmed in after the hive was disturbed". It is important to consider the context of the situation when using these synonyms, as some may be more appropriate than others depending on the scenario. In general, roll in and its synonyms are useful in painting a vivid picture of large quantities arriving at once.