Meaning of the word "a great deal of" in English

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

a great deal of

US /ə ɡreɪt dil əv/
UK /ə ɡreɪt dil əv/
"a great deal of" picture

Phrase

a large amount of something

Example:
She spent a great deal of time studying for her exams.
There's still a great deal of work to be done.