/ˈʃɛŋən əˈɡriːmənt/ – Noun
Definition: Hiệp định về tự do di chuyển và hợp tác giữa các quốc gia thành viên.
A more thorough explanation: an agreement between some European countries in Europe allowing their nationals to cross the borders without having their passport or other ID checked
Example: Under the Schengen Agreement, which Switzerland is joining, cross-border passport checks will be abolished.