upstart
🇺🇸
/ˈʌpstɑːrt/
🇬🇧
/ˈʌpstɑːt/
A person who has recently gained a position of importance and acts arrogantly.
The upstart CEO thought he knew everything and didn't listen to the experienced employees.
这位自命不凡的CEO认为自己无所不知,不听取经验丰富的员工的意见。