deep dive

• deep-dive

deep dive (plural deep dives)

1. (underwater diving) An act of deep diving.
2. (idiomatic, often with into or on) An in-depth examination or analysis of a topic.
   • 2020 December 8, David Barnett, “How John Lennon was made into a myth”, in BBC Culture‎:

     "The interesting thing as a writer about Snodgrass was that it liberated you from all the clichés about John Lennon, because you could do what you liked with him. There was no official legend of the Beatles to have to fit into," says Quantick, who also wrote a book in 2002, Revolution, which was a deep-dive into the band’s White Album.

3. Used other than figuratively or idiomatically: see deep,‎ dive.

deep dive (third-person singular simple present deep dives, present participle deep diving, simple past deep dived or deep dove, past participle deep dived)

1. Alternative form of deep-dive.

• “deep dive”, in Merriam-Webster Online Dictionary, Springfield, Mass.: Merriam-Webster, 1996–present.
• “deep dive”, in Cambridge English Dictionary, Cambridge, Cambridgeshire: Cambridge University Press, 1999–present.
• “deep dive”, in Collins English Dictionary.