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

1.
a dire il vero, per dire la verità
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.
A dire il vero, non mi piace molto la sua nuova canzone.
•
He said he was busy, but to tell the truth, he was just avoiding me.
Ha detto che era occupato, ma a dire il vero, mi stava solo evitando.