Meaning of the word "be rolling in it" in English

What does "be rolling in it" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

be rolling in it

US /bi ˈroʊlɪŋ ɪn ɪt/

UK /bi ˈrəʊlɪŋ ɪn ɪt/

to be very rich

Example:

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After selling his company, he's rolling in it.

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They must be rolling in it to afford such a huge house.