through and through is an adverb meaning "throughout the entire extent". It carries one recorded sense.
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”
Definitions, synonyms and semantic relations for through and through come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.