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A phono-semantic compound, 焐 has the fire radical 火 (huǒ) on the left, anchoring it to concepts of heat and fire, while 吾 (wú) on the right functions as the phonetic component, supplying the pronunciation. Its core meaning is to warm something up by placing it near a heat source or using body heat to remove the cold. It describes everyday gentle heating: warming hands over a stove, keeping something warm under blankets, or using a hot water bottle, as opposed to burning or large-scale combustion.
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