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Old English æmerge "ember," merged with or influenced by Old Norse eimyrja, both from Proto-Germanic *aim-uzjon- "ashes" (cf. Middle Low German emere, Old High German eimuria, German Ammern); a compound from *aima- "ashes" (from PIE root *ai- "to burn;" see edifice) + *uzjo- "to burn" (from PIE root *eus- "to burn;" cf. Latin urere "to burn, singe"). The -b- is intrusive.