
posieren
to pose
To take and hold a particular body position, usually in order to be photographed, painted, or filmed.
Die Touristen posierten für ein Foto vor dem Brandenburger Tor.
The tourists posed for a photo in front of the Brandenburg Gate.
to pose
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to pose
To take and hold a particular body position, usually in order to be photographed, painted, or filmed.
Die Touristen posierten für ein Foto vor dem Brandenburger Tor.
The tourists posed for a photo in front of the Brandenburg Gate.

to pose
To behave in a particular, often exaggerated or unnatural way in order to create a certain effect on others or to show off. This meaning is often slightly negative.
Er posiert gerne als großer Kunstkenner, obwohl er kaum Ahnung hat.
He likes to pose as a great art expert, although he knows hardly anything about it.
The verb 'posieren' (to pose) belongs to the noun 'die Pose' (the pose), which refers to an assumed body position. So someone who 'posiert' takes a pose.
Er nahm für das Foto eine lässige Pose ein.
He struck a casual pose for the photo.
The preposition reveals the meaning: 'posieren für etwas' (to pose for something, e.g. for a photo) means to take a position for a shot. 'posieren als jemand' (to pose as someone) means to act as if one were a particular person or thing.
Das Model posierte stundenlang für die neue Werbekampagne.
The model posed for hours for the new advertising campaign.
In the meaning 'to take a position', 'posieren' (to pose) is often used with 'für die Kamera' (for the camera), 'für ein Foto' (for a photo), or in front of a particular background such as 'vor einer Sehenswürdigkeit' (in front of a tourist attraction).
Alle Kinder posierten für das Klassenfoto.
All the children posed for the class photo.
When 'posieren' (to pose) is used in the sense of 'to put on airs', it has a negative connotation. It describes behavior perceived as inauthentic or boastful.
Hör auf, als Experte zu posieren, wenn du keine Ahnung hast.
Stop posing as an expert when you have no idea.
to state / boast / report
Angeben emphasizes boasting about something in order to make an impression. Posieren here describes a conspicuous, often unnatural manner or a deliberately chosen pose intended to create a particular effect. Someone who talks about their possessions is showing off; someone who presents themselves dramatically is posing.

Auf der Feier posiert Kai betont lässig neben seinem neuen Auto.
At the party, Kai poses conspicuously casually next to his new car.
Auf der Feier gibt Kai mit seinem neuen Auto an.
Kai shows off his new car at the party.