The story
- Proto-West Germanic · inherited from*brāþi“vapour, waft, exhalation, breath”
- Old English · inherited frombrǣþ“odor, scent, stink, exhalation, vapor”
- Middle English · inherited frombreeth
- English todaybreath
From Middle English breeth, breth, from Old English brǣþ (“odor, scent, stink, exhalation, vapor”), from Proto-West Germanic *brāþi (“vapour, waft, exhalation, breath”) (compare German Brodem (“haze, vapor; breath”), of a different but related formation).
Etymology from Wiktionary, CC BY-SA 4.0.