A person's first experience in a new and challenging situation, especially one that serves as a severe test of their abilities. Often refers to learning a job or role through immediate, intense exposure.
Originally a Christian theological concept referring to the Holy Spirit's fire at Pentecost, later adopted by military terminology for a soldier's first battle experience. The phrase entered general usage in the early 1900s for any intense first experience.
Military units discovered that soldiers who survived their first major battle became significantly more effective and confident - the intense shared experience created both skill and camaraderie. This 'bonding through ordeal' effect explains why many organizations still use sink-or-swim training approaches.
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