a person who has suddenly risen to a higher economic status but has not gained social acceptance of others in that class
a gymnastic exercise performed starting from a position with the legs over the upper body and moving to an erect position by arching the back and swinging the legs out and down while forcing the chest upright
Adjective:
characteristic of someone who has risen economically or socially but lacks the social skills appropriate for this new position
upstart的用法和样例：
例句
用作名词 (n.)
He was a new upstart and a gentleman of the first head. 他是个暴发户，是个新封的贵族。
You can't marry that young upstart! 你可不能嫁给那个年轻的暴发户！
用作形容词 (adj.)
Lesson those upstart person with a over-confident mind. 狠狠的修理自以为很款很有势的爆发户.
He dreaded their upstart ambition. 他惧怕他们的狂妄野心。
Pacquiao was making Hatton look like an upstart amateur. 帕奎奥弄得哈顿像个傲慢的业余拳手。
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