動詞
本來係指大個咗先中途出家去做和尚或者尼姑。引伸做人無接受過正規嘅訓練，喺無乜基礎嘅情況下，突然去做一樣比較嘅陌生嘢，通常係指人轉行去從事第個職業。 not having a solid foundation or training (for a job, etc.) due to switching trades, career paths or specialization
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半途出家
Definitions (Wiktionary)
phrase, idiomatic
to switch to a job one was not trained for; to change professions completely