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The phrase "acted as a shield" is correct and usable in written English.
It can be used to describe something that provides protection or defense against harm or danger.
Example: "The thick walls of the castle acted as a shield against enemy attacks."
Alternatives: "served as a barrier" or "functioned as a safeguard."
Exact(12)
The mountains acted as a shield from the outside world.
Turkey has long acted as a "shield for all of Europe", its prime minister pointed out this week, and should be given the help it has asked for.
They acted as a shield between the goalie and the ball as the Cameroon striker struck it, low and fierce and with swerve, inside the far post.
As a precaution, though, the spacecraft turned its large dish-shaped antenna into the direction of flight, so that it acted as a shield against small objects.
Professor Rowan Sutton, a climate scientist at Reading University, said the temperatures have levelled off in the past, the latest example being in the 1940s and 1950s when sulphate pollutants from the post-war boom in industrial production may have acted as a shield against incoming solar radiation.
Mambush – a rock-drill operator with no official rank – emerged from the mass of black workers as a rebel leader demanding justice, while some of those who were once the spearhead of the fight against repression acted as a shield protecting privilege, exploitation and extreme violence.
Similar(48)
It acts as a shield against disclosure.
The region acts as a "shield" for the electrode.
A layer of blubber may act as a shield against public humiliation.
Two months later, however, Levin is unwilling to act as a shield.
The planet's magnetic field, particularly the Van Allen radiation belt, acts as a shield to solar wind.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com