The lowest temperature at which a substance gives off vapor sufficient to form an ignitable mixture with air. Metaphorically, it refers to a critical moment when tensions or conflicts suddenly escalate into open confrontation.
Compound word combining 'flash' (from Middle English 'flashen', meaning to splash or burst forth) and 'point' (from Latin 'punctum'). The technical term emerged in the 19th century with advances in chemistry and fire safety, later extended metaphorically.
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