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Discover LudwigThe phrase "on guard against" is correct and can be used in written English.
It is typically used when referring to being vigilant or watchful against something negative or undesirable. For example, "We must remain on guard against any attempts to sabotage our plans."
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"This truly incites us to remain on guard against all forms of racism and excessive exaltation of one's identity.
He is constantly on guard against extremism.
The army is also on guard against infiltrations.
We should all be on guard against this disturbing possibility.
The news system is on guard against too much left or too much right.
Network executives say no, but they concede they are constantly on guard against that possibility.
And both must constantly be on guard against newer, nimbler rivals.
Courage, Colorni wrote, required the willingness "to always be on guard against oneself".
Still, there is reason to be on guard against backsliding toward authoritarianism.
One has to be constantly on guard against treating the material as constant and homogenous".
"We must also be on guard against urban ills," he said.
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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