also: ヒタかくす
godan verb (-su), transitive verb
desperately cover up; hide at all costs
Emphasizes a strong, often frantic effort to conceal something, typically a mistake, scandal, or embarrassing fact.
See also: ひた隠し
会社は不祥事をひた隠しにした。
The company desperately tried to cover up the scandal.
彼は
He tried to hide his mistake at all costs, but it was soon found out.