theo ‧ rize BrE AmE ( also theorise British English ) /ˈθɪəraɪz $ ˈθiːə-/ verb [intransitive and transitive]
[ Word Family: noun : ↑ theorist , ↑ theory , ↑ theorem , theoretician; verb : ↑ theorize ; adverb : ↑ theoretically ; adjective : ↑ theoretical ]
to think of a possible explanation for an event or fact SYN hypothesize
theorize that
Researchers theorize that there was once a common language for all humanity.
theorize about
They have been theorizing about what may have caused the fire.