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Discover LudwigThe phrase "he called upon" is correct and usable in written English.
It can be used when referring to someone requesting or summoning someone else for a specific purpose or action.
Example: "During the meeting, he called upon his colleagues to share their insights on the project."
Alternatives: "he summoned" or "he requested".
Exact(58)
He called upon the faithful to be exemplary in their behavior, though.
In March, he called upon a nearly deserted Commons chamber to investigate the allegations.
He called upon his Hun allies, who destroyed the city in 436.
He called upon the ethics panel to move forward with a full inquiry.
To prepare for the part, he called upon his experience playing something else entirely – a giraffe.
He called upon Americans to "make our country more just and generous".
But he called upon more than grit in his scouting work.
To provide advice on gene-hunting, he called upon Dr. Cox, the Stanford geneticist.
Herman Toivo ja Toivo, when freed, never gave any undertaking, nor was he called upon to do so.
Then he called upon the Indians, "Let us kill them all off today, that they may not trouble us anymore.
In 852 or 853 he called upon Aethelwulf of Wessex to aid him in subduing the North Welsh.
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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