cov·er–up 
/ˈkʌvɚˌʌp/ noun
plural cov·er–ups /ˈkʌvɚˌʌp/ noun [count] 1 : a planned effort to hide a dishonest, immoral, or illegal act or situation
▪ The book describes the burglary and its ensuing cover-up. ▪ The report exposes an attempted cover-up of the accident. 2 : an action or a way of behaving that is meant to prevent people from knowing about something
▪ His brash manner is just a cover-up for his insecurity. — see also cover up at 1cover
▪ The book describes the burglary and its ensuing cover-up. ▪ The report exposes an attempted cover-up of the accident.
▪ His brash manner is just a cover-up for his insecurity. — see also cover up at 1cover
