This is the 11378th most frequent German word.
sperre
"Blockade," "barrier," or "closure."
Here, 'Sperre' refers to a physical blockade, often restricting access.
Die Straße war wegen einer Sperre nicht befahrbar.
The road was not passable due to a barricade.
In this context, 'Sperre' denotes a restriction or block, usually a programmatic or technical one.
Ich habe den Anruf blockiert, weil ich eine Sperre eingestellt habe.
I blocked the call because I set up a restriction.
Here, 'Sperre' means a ban or prohibition, often temporary, usually in sports or official regulations.