gate·keep·er 
/ˈgeɪtˌki:pɚ/ noun
plural gate·keep·ers /ˈgeɪtˌki:pɚ/ noun [count] : a person who guards a gate
▪ the palace gatekeeper — sometimes used figuratively ▪ teachers who consider themselves the gatekeepers of knowledge
▪ the palace gatekeeper — sometimes used figuratively ▪ teachers who consider themselves the gatekeepers of knowledge
