
das Wunder
miracle
An extraordinary, inexplicable event that is often regarded as supernatural or divine.
Die plötzliche Genesung des Patienten grenzte an ein Wunder.
The patient's sudden recovery bordered on a miracle.
miracle / wonder
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miracle
An extraordinary, inexplicable event that is often regarded as supernatural or divine.
Die plötzliche Genesung des Patienten grenzte an ein Wunder.
The patient's sudden recovery bordered on a miracle.

miracle
A very surprising, amazing, and fortunate thing, person, or achievement.
Es ist ein Wunder, dass bei dem Unfall niemand verletzt wurde.
It is a miracle that no one was injured in the accident.

to be in for a nasty surprise
An idiom meaning to experience a very unpleasant or nasty surprise.
Wenn du deine Hausaufgaben nicht machst, wirst du morgen in der Schule dein blaues Wunder erleben.
If you don't do your homework, you'll be in for a nasty surprise at school tomorrow.
The noun 'Wunder' is the root for many other words. These include the verb 'sich wundern' (to be surprised), the adjective 'wunderbar' (very good, fantastic), and the participle 'verwundert' (surprised/astonished).
Ich wundere mich, dass er schon wieder zu spät ist.
I am surprised that he is late again.
In the context of inexplicable events, 'Wunder' is often combined with certain verbs. Typical phrases are 'auf ein Wunder hoffen' (to hope for a miracle), 'an ein Wunder glauben' (to believe in a miracle), or when something 'an ein Wunder grenzt' (borders on a miracle).
Die Ärzte hatten die Hoffnung fast aufgegeben, aber die Familie glaubte fest an ein Wunder.
The doctors had almost given up hope, but the family firmly believed in a miracle.
To describe a surprising, fortunate fact, the structure 'Es ist ein Wunder, dass ...' (It is a miracle that ...) is often used. It is followed by a subordinate clause in which the verb comes at the end.
Es ist ein Wunder, dass du die Prüfung ohne Vorbereitung bestanden hast.
It is a miracle that you passed the exam without preparing.
The idiom 'sein blaues Wunder erleben' means to experience a nasty surprise. The word 'blaues' is a fixed part here, and the possessive pronoun (sein, dein, ihr, etc.) changes to match the person.
Wenn der Chef herausfindet, dass du gelogen hast, wirst du dein blaues Wunder erleben.
If the boss finds out that you lied, you'll be in for a nasty surprise.
happiness / luck
When something turns out well, Glück refers to a fortunate coincidence. A Wunder goes beyond that, seeming extraordinary, almost inexplicable, or particularly astonishing. In the case of an unexpected rescue, Glück is appropriate when the fortunate coincidence is the focus, and Wunder when the outcome seems almost impossible.

Es war ein Wunder, dass der Vermisste nach drei Tagen lebend gefunden wurde.
It was a miracle that the missing person was found alive after three days.
Es war großes Glück, dass sofort eine Ärztin am Unfallort war.
It was very lucky that a doctor was immediately at the scene of the accident.