
der Mann
man
An adult male person.
Der Mann an der Kasse trug einen Hut.
The man at the checkout was wearing a hat.
man
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man
An adult male person.
Der Mann an der Kasse trug einen Hut.
The man at the checkout was wearing a hat.

husband
A person's husband or steady life partner.
Ich gehe heute Abend mit meinem Mann ins Kino.
I'm going to the movies with my husband tonight.

person / member
A person who is suitable for or assigned to a particular task or position; a member of a group or team.
Für diese Reparatur brauchen wir den richtigen Mann.
For this repair, we need the right person.

to hold one's own
To prove oneself in a difficult situation, fulfill one's tasks well, or assert oneself.
Obwohl er neu im Team war, hat er von Anfang an seinen Mann gestanden.
Although he was new to the team, he held his own from the very beginning.
The word 'Mann' (man) is often the final part of compound nouns, such as 'Schneemann' (snowman), 'Kaufmann' (businessman/merchant), or 'Feuerwehrmann' (firefighter). These often, but not always, refer to a male person.
Als Geschäftsmann ist er viel auf Reisen.
As a businessman, he travels a lot.
The word 'Mann!' (man!) is used colloquially as an exclamation to express surprise, annoyance, or enthusiasm. It often comes at the beginning of the sentence and is strongly emphasized.
Mann, war das ein spannendes Fußballspiel!
Man, what an exciting soccer game that was!
When 'Mann' is used with a possessive pronoun like 'mein' (my), 'dein' (your), or 'ihr' (her/their), it almost always means 'husband' or steady partner. Without a possessive pronoun, it usually refers to any male person.
Mein Mann kocht heute Abend für uns.
My husband is cooking for us tonight.
The phrase 'der richtige Mann für den Job' (the right man for the job) is often used figuratively. It means 'the best-suited person', regardless of gender.
Für diese schwierige Verhandlung brauchen wir unseren besten Mann.
For this difficult negotiation, we need our best person.
The idiom 'seinen Mann stehen' (to hold one's own) means to prove oneself or master a challenge. The possessive pronoun agrees with the person (ich stehe meinen Mann, sie steht ihren Mann).
In der Krise hat die Bürgermeisterin wirklich ihren Mann gestanden.
In the crisis, the mayor really held her own.
age
Mann! and Alter! can both spontaneously express surprise, annoyance, or excitement. Alter! sounds more strongly associated with youth slang and can also be used as a familiar form of address. Mann! works as a general colloquial exclamation, while Alter! is especially common among young people who know each other well.

Mann, war dieses Konzert laut!
Man, was that concert loud!
Alter, war dieses Konzert laut!
Dude, was that concert loud!