versprochen
promised
Used to reinforce a statement or promise in order to emphasize its binding nature and truth. It expresses that you are giving your word.
Ich rufe dich morgen an, versprochen!
I'll call you tomorrow, promised!

promised
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promised
Used to reinforce a statement or promise in order to emphasize its binding nature and truth. It expresses that you are giving your word.
Ich rufe dich morgen an, versprochen!
I'll call you tomorrow, promised!

'Versprochen' is formally the past participle of the verb 'versprechen' (to promise). In this use, however, it functions like a particle or adverb to reinforce a statement.
Ich habe das Buch versprochen, aber noch nicht geschenkt.
I promised the book, but I haven't given it as a gift yet.
As reinforcement, 'versprochen' (promised) typically stands at the end of the sentence, often separated by a comma. It can also be used as a short, independent answer to a question or request.
Ich helfe dir beim Umzug, versprochen!
I'll help you move, promised!
The use of 'versprochen!' (promised!) as reinforcement is very typical of spoken language and informal communication. It gives a commitment personal weight.
Das bleibt unser Geheimnis, versprochen.
This stays our secret, promised.
sure / safe
'sicher' and 'versprochen' can both make a statement stronger. 'sicher' means that you believe something without doubt or consider it certain. 'versprochen' is used when you give your word and the other person should be able to rely on it. Learners may confuse the words because both sound like a strong confirmation. The difference is: 'sicher' shows conviction, while 'versprochen' is a personal promise.

Ich bringe dir morgen das Buch zurück, versprochen.
I'll bring the book back to you tomorrow, promised.
Am Montag ist das Geschäft sicher wieder geöffnet.
The shop will surely be open again on Monday.