(idiomatic) To perceive things as different, or to perceive their difference itself; to differentiate, distinguish, discriminate.

(idiomatic) An attestation to the truthfulness and frankness of an associated statement.

One has a feeling, hunch or a gut feeling that (something is true).

(idiomatic, informal) Used to indicate that the speaker was in agreement with the preceding statement before it was made.

(idiomatic, informal) Used to positively assert the frank honesty of an associated statement of set of statements; equivalent to "to you tell the truth".

Synonym of to be honest

Advice to writers: convey an impression by the way that events are described in the narrative, and not by explicitly stating facts.

(idiomatic, sarcasm) Used in response to an assertion that one is already fully aware of.

I do not believe you; you are joking.

(idiomatic, colloquial) Synonym of I can tell you