la muralla

wall, city wall, barrier

m u ˈɾ a ʝ a
noun · feminine Rare #52,396
wall, city wall Usually a large, strong wall, especially one built around a city or fortress.
SP: La muralla rodea el castillo.
EN: The wall surrounds the castle.
barrier Can be used figuratively for someone or something that is very strong or hard to get past.
SP: En defensa, ese jugador es una muralla.
EN: On defense, that player is a wall.

No te apoyes contra esta muralla.

Don't lean against this wall.

Una muralla rodeaba la vieja ciudad.

A wall surrounded the old city.

¿Por qué pintaste negra esta muralla?

Why did you paint this wall black?

Tú Rudo eres una muralla, eh.

You, Rudo, are a brick wall, huh?

— Rudo y Cursi (2008)