ГОРЕТЬ _|_ BURN / GORET [ɡɐˈrʲetʲ] 

Hint with an alternative definition: go red* & scorch or go rot because of a great hot & fire (flame terror), for example in a fire grate or crater or by the sacred torch in a grot / *go red like a cigarette, a carrot or gory thing.

Hints with a mirror: tears of terra & rock (water & soil) | гореть (fire)

Russian pro-tip: гр-р-р (треск костра, искр, огня) от трения (of two firestones)

Mental visualization: Г (dry brushwood) + OР (two firestones and a spark between them) + E (smoke) + TЬ (first flame) 

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Гарь (cinder, burnt / ɡˈarʲ) — dark-gray ash or char from fire / like a “gur coal” & carbon / Загар — it is a good sun-care for skin (gold or corn-colored) or rage of sun (burn)it is a good sun-care for skin (gold or corn-colored) or rage of sun (burn) Нагар — a candle snuff

Mental visualization: Н (две свечи) + а (нарост на фитиле) + Г (фитиль) + а (нарост на фитиле) + Р (сгоревшая свечка)