Why this word is great
SMOLDER — [Verb] To burn slowly with smoke but no flame, or to exist in a suppressed state, as of emotion. From Middle English smolderen ("to suffocate, stifle"), from Middle English smolder ("smoke, smoky vapour"), ultimately from Proto-West Germanic *smolōn ("to burn, glow, fume, smoulder"), related to Proto-West Germanic *smallijan (source of English smell). Unlike "singe," which implies a brief, superficial scorch, or "molder," which suggests a quiet decay into dust, to smolder is to harbor a persistent, subsurface combustion. It is the deep ember of a forgotten campfire at dawn, the resentment banked for years behind a civil smile, the peat fire hissing for centuries beneath the bog—a testament to the latent power of things that refuse either to flare or to go out.