to out
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to come out
To voluntarily make one's own previously secret sexual orientation or gender identity publicly known.
Der Fußballprofi hat sich in einem bewegenden Interview geoutet.
The professional footballer came out in a moving interview.
'Outen' is a loanword from English (to out). In German, it is conjugated like a regular weak verb: 'ich oute' (I out), 'du outest' (you out), 'er outet' (he outs), 'geoutet' (outed).
Sie hat sich gestern vor ihrer ganzen Familie geoutet.
She came out to her whole family yesterday.
You can recognize the meaning from the sentence structure. 'Sich outen' (to come out; reflexive) means to speak about oneself. 'Jemanden outen' (to out someone; transitive with an accusative object) means to speak about another person. 'Sich outen als' usually refers to a preference or trait.
Er hat sich vor seinen Freunden geoutet.
He came out to his friends.
In its main meaning, 'outen' (to out/come out) is a reflexive verb. The reflexive pronoun ('sich') is in the accusative and is obligatory.
Es erfordert viel Mut, sich am Arbeitsplatz zu outen.
It takes a lot of courage to come out at work.
The use of 'sich outen als' (to reveal oneself as) for preferences or opinions is colloquial and often meant humorously. It describes a playful 'confession' about something that was not really a secret.
Nach dem dritten Stück Kuchen musste ich mich als Naschkatze outen.
After the third piece of cake, I had to reveal myself as someone with a sweet tooth.
to reveal / betray
'verraten' and 'outen' can both mean that something private or secret becomes known. 'verraten' is very general: it can refer to any secret or confidential information. 'outen' is more specific. It often concerns sexual orientation or gender identity, and with 'jemanden outen' (to out someone), private information is made public without consent. Colloquially, you can also 'sich als Fan einer Sache outen' (reveal yourself as a fan of something) or 'sich mit einer Meinung outen' (openly admit to an opinion). The words can be confused because both have to do with revealing information. However, 'outen' only fits in certain personal or public contexts; 'verraten' is more neutral and can be used more broadly.
In einem Interview outete sich der Schauspieler und sprach offen über sein Privatleben.
In an interview, the actor came out and spoke openly about his private life.
Du hast mir ein Geheimnis anvertraut, und ich werde es nicht verraten.
You entrusted me with a secret, and I will not reveal it.