1
general::
Phrase(s): through and through
thoroughly; completely. • I’ve studied this report through and through trying to find the facts you’ve mentioned. • I was angry through and through, and I had to sit and recover before I could talk to anyone.
McGrawhill's American Idioms And Phrasal Verbs
2
general::
In every part or aspect, throughout. For example, I was wet through and through, or He was a success through and through. This idiom originally was used to indicate literally penetration, as by a sword. The figurative usage was first recorded in 1410.
American Heritage Idioms