blas ‧ pheme /blæsˈfiːm/ BrE AmE verb [intransitive]
[ Date: 1300-1400 ; Language: Late Latin ; Origin: blasphemare , from Greek , from blasphemos 'speaking evil' ]
to speak in a way that insults God or people’s religious beliefs, or to use the names of God and holy things when swearing
—blasphemer noun [countable]