出で来き星ぼし

noun

upstart; mushroom millionaire

Refers to someone who has suddenly risen to wealth or prominence, often with a nuance of lacking refinement or old money status. Somewhat dated; more common in literary or historical contexts.

• 彼かれは一いち代だいで財ざいを成なした出で来き星ぼしだ。

  He is an upstart who made his fortune in one generation.

• 古ふるい小しょう説せつには、出で来き星ぼしと蔑さげすまれる成なり金きんがよく登とう場じょうする。

  In old novels, nouveau riche characters derided as upstarts often appear.