Definition of to tell you the truth in English:

to tell (you) the truth

(or truth to tell or if truth be told)
To be frank (used especially when making an admission): I think, if truth be told, we were all a little afraid of him to tell you the truth, I’ve never met the guys
More example sentences
  • But I don't actually envy her, because truth to tell, I hate weddings.
  • Will said with a slight smile in his voice, ‘That realisation has been a long time coming, in fact you've been a bit slow on the uptake if truth be told.’
  • They clapped, they beamed, they leapt to their feet to welcome a speech that, truth to tell, was more a statement of intent than a programme for government.
See parent entry: truth