Verb (5-dan, く, transitive)
1. to go through; to pierce; to penetrate
刃の先が、シーツを貫く。The tip of the blade pierces the sheet.
2. to run through (e.g. a river through a city); to pass through
3. to stick to (opinion, principles, etc.); to carry out; to persist with; to keep (e.g. faith); to maintain (e.g. independence)
僕は、自分の正義を貫く事しか考えてなかったんだ。I was only thinking about sticking to my own sense of justice.