1
general::
Increasingly, to a steadily growing extent or degree. For example, As night came on, we were getting more and more worried, or More and more I lean toward thinking he is right. [c. 1200]
American Heritage Idioms
2
general::
Phrase(s): more and more
an increasing amount; additional amounts. • As I learn more and more, I see how little I really know. • Dad seems to be smoking more and more lately.
McGrawhill's American Idioms And Phrasal Verbs