Definition:
"Rattle down" is a phrasal verb that means to speak or recite something quickly and often without stopping. This can be done in an excited or enthusiastic manner, and it often implies that the speaker is sharing a lot of information in a short amount of time.
In a more advanced context, "rattle down" can imply a sense of urgency or excitement in the way information is being delivered. It can also suggest that the speaker is so knowledgeable about a topic that they can easily share many details without pauses.
In summary, "rattle down" is a lively way to describe someone who is sharing information rapidly and enthusiastically. It is useful in both casual conversation and more detailed discussions when emphasizing a fast pace of speaking.