in opposition to
US /ɪn ˌɑːpəˈzɪʃən tə/
UK /ɪn ˌɑːpəˈzɪʃən tə/

1.
in conflict or disagreement with
:
•
The new policy was met with strong resistance in opposition to the proposed changes.
•
The community stood united in opposition to the construction of the new factory.