'singed' originates from Old English, specifically the word 'sengan', where the root meant 'to burn' or 'to scorch'.

'singed' changed from Middle English forms such as 'singen' or 'sengen' and eventually became the modern English verb 'singe' with the past form 'singed'.

Initially it meant 'to burn or scorch' and it has retained that basic sense; modern use emphasizes a light or superficial burning.