Idioms of truth in English

be economical with the truth

if you say that somebody has been economical with the truth, you mean that they left out some important facts, but you do not want to say that they were lying

bend the truth

to say something that is not completely true

I wasn’t exactly lying when I said I hadn’t seen her—I was just bending the truth a little.

if (the) truth be known/told

used to tell somebody the true facts about a situation, especially when these are not known by other people

If the truth be known, I was afraid to tell anyone.

in truth

(formal) used to emphasize the true facts about a situation

She laughed and chatted but was, in truth, not having much fun.

the moment of truth

a time when somebody/something is tested, or when important decisions are made

The moment of truth is when the trainee pilots take over the controls of the plane.

nothing could be further from the truth

used to say that a fact or comment is completely false

She thinks I don’t like her but nothing could be further from the truth.

I know you think she's mean, but nothing could be further from the truth.

to tell (you) the truth

(informal) used when admitting something

To tell you the truth, I'll be glad to get home.

I got a bit big-headed, to tell the truth.

To tell you the truth, I'm rather dreading his return.

truth is stranger than fiction

(saying) used to say that things that actually happen are often more surprising than stories that are invented

(the) truth will out

(saying) used to say that people will find out the true facts about a situation even if you try to keep them secret