arriviste

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Fire was here long before arriviste plants like grasses; it pre-dated the first flowers.
火在草这类生长迅猛的植物存在前很久就存在；而且吞噬了第一批花朵。
In his memoirs, Tony Blair guesses that he unsettled the Establishment by being an “arriviste”: neither born into the elite nor knowing his proper place.
在自己的回忆录中，托尼•布莱尔认为由于自己实属“暴发户”——“生来就不不属于精英团队，也不知道自己到底处于一个什么地位”，所以没有碰触即成体制这一问题。
She had more respect for Michaelis, on whose name they all poured such withering contempt, as a little mongrel arriviste, and uneducated bounder of the worst sort.
他们一提起蔑克里斯的名，便盛气凌人地骂他是杂种的幸进者，是无教育的最贱的下流人，但是康妮却比较尊重他。

Most of it supports Mr Fox, but some members still resent him as a rude, loud-mouthed and ideologically dubious arriviste.
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You describe someone as an arriviste when you are criticizing them because they are trying very hard to belong to an influential or important social group which you feel they have no right to belong to.