arriviste
🇺🇸
/ˌæriːˈviːst/
🇬🇧
/ˌæriːˈviːst/
Someone who tries very hard to become part of a higher social class or group, even if they don't really belong there.
The new manager was an arriviste, always trying to impress the board members with his flashy suits and expensive cars.
新しいマネージャーは成り上がり者で、いつも派手なスーツや高級車で役員たちに印象を与えようとしていました。