Meaning of the word "delve into" in English

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

delve into

US /ˈdɛlv ˈɪntuː/
UK /ˈdɛlv ˈɪntuː/

Phrasal Verb

to research or investigate something thoroughly

Example:
We need to delve into the company's financial records.
The detective decided to delve into the suspect's past.
Related Word: