The phrase "a deep allegiance" is correct and usable in written English.
It can be used to describe a strong loyalty or commitment to a person, group, or cause.
Example: "The soldiers felt a deep allegiance to their country, willing to sacrifice everything for its freedom."
Alternatives: "a strong loyalty" or "a profound commitment".
Del Rey relocated to California in her mid-twenties, and it's now challenging to find a promotional photograph of her that does not, in one way or another, suggest a deep allegiance to the state.
Though in his youth the West Side was a troubled part of the city, he, like many of its residents, past and present, feels a deep allegiance to it.
I sided with the advice of my American doctor, revealing either a deep allegiance to the United States — or a deep aversion to stabbing myself in the stomach with a needle.
Southerners claim a deep allegiance to the good old United States of America but ironically celebrate their ancestors' efforts to dissolve the very union of states whose flag they now so proudly fly.
Too many leaders on both sides of the aisle have a deeper allegiance to private interests than to the public they are sworn to represent.
The reasons for black people's deep allegiance to the Democratic party aren't complicated.
An honor that began as a way to recognize spies for their work during World War II has come to reflect the particular ethos of each administration and the deep allegiances a handful of people have inspired over a lifetime.
It's built on deep allegiances and cutthroat margins, and its inner workings, especially in Buck's stories about his own McAllister clan, are full of intrigue and successionary drama: fistfights, lawsuits, power struggles, and disinheritances; raging, intemperate fathers and sullen, rebellious sons.
Yet Oregon voters' deepest allegiance may be to independence.
Where is our deepest allegiance?
Now would be a good time for the president to reaffirm that position and for Democrats in Congress to press for its enactment, if only to continue to highlight the huge contradiction between Republicans' alleged concern for working families and their deeper allegiance to free market theology.
