die Nationalelf
national team
A country's national football team, especially the eleven players who are on the field.
Die deutsche Nationalelf hat das Spiel gegen Frankreich gewonnen.
The German national team won the game against France.

national team
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national team
A country's national football team, especially the eleven players who are on the field.
Die deutsche Nationalelf hat das Spiel gegen Frankreich gewonnen.
The German national team won the game against France.

The word consists of 'National' (national) and 'Elf' (eleven). 'Elf' is the number 11 and refers to the eleven players of a football team who are on the field.
Die Fans feierten die erfolgreiche Nationalelf.
The fans celebrated the successful national team.
This term is used almost exclusively in the context of 'Fußball' (football/soccer) to refer to a country's national team. It is very common in sports reporting and everyday speech.
Der Trainer gab die Aufstellung der Nationalelf für das nächste Spiel bekannt.
The coach announced the national team's lineup for the next game.
The word is usually combined with an adjective indicating nationality, for example 'die deutsche Nationalelf' (the German national team) or 'die brasilianische Nationalelf' (the Brazilian national team).
Die italienische Nationalelf bereitet sich auf die Weltmeisterschaft vor.
The Italian national team is preparing for the World Cup.
team / crew
'die Mannschaft' and 'die Nationalelf' can both mean a team in sports. 'Mannschaft' is general and can be used for many sports and clubs. 'Nationalelf' is much more specific: it means a country's national football team. The word is used especially in football, even though it does not always refer to exactly eleven players. The words can be confused because a 'Nationalelf' is also a 'Mannschaft'. But not every 'Mannschaft' is a 'Nationalelf'. For a normal club team, you say 'Mannschaft'; for a country's football team, 'Nationalelf' fits.

Die Nationalelf hat im letzten Spiel zwei neue Spieler eingesetzt.
The national team used two new players in the last match.
Die Mannschaft aus unserem Ort spielt am Samstag gegen den Nachbarverein.
The team from our town is playing against the neighboring club on Saturday.