preposition
1.
in conflict with
the case of John Doe versus Richard Roe
Synonyms: against
Related Word: con, contra
Idioms: at cross-purposes with ( or to), at odds with, at outs with, at variance with, on the outs with
2.
in contrast with
the age-old argument about free trade versus protection
Synonyms: over against, vis-à-vis
Idioms: as opposed to