upstart

暴发户、新贵贬义

The old families in town looked down on the wealthy upstart.

镇上的老家族瞧不起那个有钱的暴发户。

狂妄的新手、自命不凡者贬义

Some senior staff dismissed him as an arrogant upstart.

部分资深员工把他当成狂妄自大的新手而不予理会。

新兴的、初出茅庐的多置于名词前

An upstart airline is stealing customers from the major carriers.

一家新兴航空公司正在抢走大型航空业者的客源。