opponent
US /əˈpoʊ.nənt/
UK /əˈpoʊ.nənt/

1.
adversaire, opposant
someone who competes against or fights another in a contest, game, or argument
:
•
He defeated his opponent in the final round.
Il a vaincu son adversaire au dernier tour.
•
The debaters presented strong arguments against their opponents.
Les débatteurs ont présenté des arguments solides contre leurs adversaires.
2.
opposant, détracteur
a person or group who is against something, such as a policy, idea, or action
:
•
The new policy faced strong resistance from its opponents.
La nouvelle politique a rencontré une forte résistance de la part de ses opposants.
•
She became a vocal opponent of the proposed development.
Elle est devenue une opposante vocale au projet de développement.