/geɪtkiːpər/ – Noun
Definition: Người kiểm soát, người giữ cửa.
A more thorough explanation: 1. a person or thing that controls access to something
2. a person whose job is to control who goes through a gate
Example: 1. The new register will act as a gatekeeper for foreign students seeking visas.
2. You’ll need to show your pass to the gatekeeper, otherwise he won’t let you in.