the.com/smolder

the slow burn that skips the flame and goes straight for the damage

means To burn slowly without flame, giving off smoke and heat — or, of a feeling like anger or desire, to persist quietly and intensely beneath the surface.

from From Middle English smolderen, meaning to suffocate or smother in smoke. It's tied to a family of words about choking and stifling — a cousin to 'smother' itself. The root sense is less about light than about thick, airless smoke, which is why a smolder is a fire that's been denied its flame but not its slow, suffocating heat. The figurative use — a smoldering look, a smoldering grudge — is a later flourish, taking the literal choked-down burn and applying it to emotions kept under wraps.

no flame
combustion without visible fire, just heat and smoke
long haul
peat fires can smolder underground for centuries
silent killer
smoke kills more victims than open flames do
hard to stop
smoldering reignites long after firefighters leave
the look
borrowed by faces too cool to grin
for instance

yellowstone caldera — massive geothermal system in wyoming continuously smoldering with thermal features since at least the 1870s

mount wilis crater — volcanic crater in indonesia continuously smoldering and releasing smoke from geothermal activity

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