Definition of fire edge in US English:

fire edge

noun

  • 1The cutting edge of a newly-forged blade hardened by fire. Chiefly figurative: keenness, freshness, or vitality; the quality of being hard, stern, or inflexible. Now regional.

  • 2The outer extent of a wildfire, especially the leading edge.

Origin

Late 16th century; earliest use found in John Knox (c1514–1572), religious reformer. From fire + edge.

Pronunciation

fire edge

/ˈfʌɪə(r) ɛdʒ/