source, s.Foinse f, buntobar m, ábhar m, údar m.To trace sth, back to its source, lorg ruda a chur siar go bun. Source of infection, máthair aicíde. Idleness is the source of all evil, is é an díomhaointeas bun is barr gach oilc. I know it from a good source, tá sé agam ó urra maith.