English
afterburn
From after- + burn.
Proto-Indo-European *bʰrewh₁- ‘to boil’
Proto-Indo-European *bʰrenw-
Proto-Germanic *brinnaną ‘to burn’
Old Norse brinna ‘to burn’
Middle English burne
English burn
Today it means
noun The burning of further calories after the end of a period of vigorous exercise.
Language periods are conventional ranges, not dates for this word.
Etymograph / afterburn