What is the word for 'saying more than you intended'?

What is the word for saying more than you intended?

For example: When a criminal refers in casual converstion to the place or method of a crime because it is playing on his mind.

Solution 1:

When you reveal something inadvertently it is (from Collins)

let slip
_PHRASE

If you let slip information, you accidentally tell it to someone, when you wanted to keep it secret.

Example: I bet he let slip that I'd gone to America.

Solution 2:

Merriam-Webster does not even flag this as informal, but surely it is:

blab [verb] [intransitive]

...

2: to reveal a secret especially by indiscreet chatter

[transitive]

to reveal especially without reserve or discretion

blabbed the whole affair to the press

Cambridge English Dictionary adds the 'informal' tag and gives a more closely matching definition:

blab verb [ I or T ] informal:

to talk carelessly or too much, often telling others something you should keep secret....

Solution 3:

The phenomenon is called Freudian slip.

Freudian slip: A Freudian slip, also called parapraxis, is an error in speech, memory, or physical action that occurs due to the interference of an unconscious subdued wish or internal train of thought. [Wikipedia]

Or Parapraxis.

Parapraxis: a slip of the tongue or pen, forgetfulness, misplacement of objects, or other error thought to reveal unconscious wishes or attitudes. [Dictionary.com]

Or Lapsus.

If you need a verb for the action of saying more than intended, then I suggest blurt.

Blurt (out): To utter suddenly or inadvertently; divulge impulsively or unadvisedly (usually followed by out).

Example: He blurted out the hiding place of the spy. [Dictionary.com]

Or spill the beans also fit the description.

Solution 4:

In American military propaganda, the term "Loose lips" was used to refer to accidentally revealing secret information that an enemy could use against them, the full phrase being Loose lips sink ships.