to tell the truth
US /tə tel ðə truːθ/
UK /tə tel ðə truːθ/

1.
à vrai dire, pour dire la vérité
used to introduce a statement of fact or opinion, often one that is surprising or unexpected
:
•
To tell the truth, I don't really like his new song.
À vrai dire, je n'aime pas vraiment sa nouvelle chanson.
•
He said he was busy, but to tell the truth, he was just avoiding me.
Il a dit qu'il était occupé, mais à vrai dire, il m'évitait juste.