It seems like you might be referring to the word "cumulus" instead of "cumulous." Let's clarify this word for you!
Cumulus (adjective): This word describes something that is piled up or heaped together. It's often used to refer to clouds that look fluffy and are piled up in the sky.
In a more advanced context, "cumulus" can be used metaphorically or in scientific discussions. For example, in meteorology, "cumulus" refers specifically to a type of cloud that forms when warm air rises and cools, creating fluffy white clouds.
While "cumulus" itself doesn't have specific idioms or phrasal verbs associated with it, you might hear phrases like "piled high" or "heaped upon" that convey a similar meaning.
In summary, "cumulus" refers to something that is piled up, often used to describe fluffy clouds in the sky. It can also be used in various contexts to indicate that things are stacked or heaped together.