'through and through' definitions:

Definition of 'through and through'

(from WordNet)
adverb
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, through and through]

Synonyms of 'through and through'

From: Moby Thesaurus