swim against the tide
US /swɪm əˈɡɛnst ðə taɪd/
UK /swɪm əˈɡɛnst ðə taɪd/

1.
nager à contre-courant, aller à l'encontre de l'opinion générale
to go against the general opinion or trend; to do something that is not popular or goes against what most people are doing
:
•
He decided to swim against the tide and pursue a career in art, despite his family's expectations for him to become a doctor.
Il a décidé de nager à contre-courant et de poursuivre une carrière artistique, malgré les attentes de sa famille qu'il devienne médecin.
•
It's hard to swim against the tide when everyone else is doing the opposite.
Il est difficile de nager à contre-courant quand tout le monde fait le contraire.