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Definition of Trial by fire
1. Noun. A test in which a person is exposed to flames in order to assess his/her truthfulness, commitment, courage, etc. ¹
2. Noun. A situation in which a soldier or other combatant faces the discharge of opposing weapons, as a test of his or her fortitude. ¹
3. Noun. (idiomatic by extension) Any ordeal which tests one's strength, endurance, or resolve. ¹
¹ Source: wiktionary.com