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trial by fire▼◼◼◼(idiomatic: any ordeal which tests one's strength, endurance, or resolve)
noun

trial by fire▼◼◼◼(situation in which a soldier or other combatant faces the discharge of opposing weapons)
noun

trial by fire▼◼◼◼(test in which a person is exposed to flames)
noun

crucible [crucibles]▼◼◻◻(difficult and trying experience)
noun
[UK: ˈkruː.sɪb.l̩] [US: ˈkruː.səb.l̩]