From Longman Dictionary of Contemporary Englishblasphemeblas‧pheme /blæsˈfiːm/ verb [intransitive] RRCINSULTto 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]→ See Verb tableOrigin blaspheme (1300-1400) Late Latin blasphemare, from Greek, from blasphemos “speaking evil”