Wiktionary
through and through
adv. (context idiomatic English) completely; entirely; fundamentally. n. A bullet wound in which the bullet passes through the body.
WordNet
through and through
adv. throughout the entire extent; "got soaked through in the rain"; "I'm frozen through"; "a letter shot through with the writer's personality"; "knew him through and through"; "boards rotten through and through" [syn: through]
Wikipedia
Through and through
Through and through describes a situation where an object, real or imaginary, passes completely through another object, also real or imaginary. The phrase has several common uses: