There are multiple definitions - click on the translation that matches your context.

bluźnić, złorzeczyć

czasownik

full

blaspheme

verb

Definitions of blaspheme

to say things about God or about someone's religious beliefs that followers of that religion would find offensive

I didn't mean to blaspheme her religion in any way, I was only questioning her interpretation of one of its teachings.

to swear using God's name or the name of an important religious figure in an offensive way

I heard him blaspheme God when he hit his thumb with a hammer.