black marketeer / slider / flat cap
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black marketeer
A person who does illegal business, especially with goods that are scarce or hard to obtain (black market trade).
Nach dem Krieg verdienten viele Schieber ein Vermögen auf dem Schwarzmarkt.
After the war, many black marketeers made a fortune on the black market.
All meanings of 'der Schieber' come from the verb 'schieben' (to push, to slide). A 'Schieber' is either a person who illegally 'pushes' goods, or a technical part that you 'slide'.
Kannst du bitte den Schieber am Fenster zumachen?
Could you please close the slider on the window?
You can recognize the meaning from the context: if it is about crime or the black market, the person is meant. In a technical context, the component is meant. If it is about clothing, the cap is meant.
Während der Blockade wurde er zum Schieber für Medikamente.
During the blockade, he became a black marketeer for medicines.
The expression 'einen Schieber haben' means to be very angry. It is colloquial and is always formed with the verb 'haben' (to have).
Ich habe so einen Schieber, weil mein Fahrrad schon wieder gestohlen wurde!
I'm so furious because my bike has been stolen again!
The meaning 'Schwarzmarkthändler' (black marketeer) often has a negative or derogatory connotation and is frequently used in connection with postwar periods or economic crises.
Mein Großvater erzählte Geschichten über die Schieber in Berlin nach dem Krieg.
My grandfather told stories about the black marketeers in Berlin after the war.
flap / mouth
'Klappe' and 'Schieber' can both be parts of a device or container that are used to close or open an opening. The difference is the movement. A 'Klappe' is usually flipped open or shut, often with a hinge. A 'Schieber' is slid to the side, upward, or downward. The words can be confused because both cover or regulate something. If the part turns or flips open, 'Klappe' fits better. If you slide it, 'Schieber' is more precise.
Mit dem kleinen Schieber kann man die Lüftung am Fenster öffnen.
You can open the ventilation on the window with the small slider.
Am Briefkasten klemmt die Klappe, deshalb geht sie nicht richtig zu.
The flap on the mailbox is stuck, so it doesn't close properly.