godan verb (-su), transitive verb
keep secret; conceal completely; hide until the end
Emphasizes successfully hiding something all the way through, without ever revealing it. Often used for secrets, true feelings, or facts one intends to take to the grave.
彼は最後まで真実を隠し通した。
He kept the truth hidden to the very end.
あの事件のことは
I intend to keep that incident a secret for the rest of my life.