The phrase "as it narrowed" is correct and usable in written English.
It can be used to describe a situation where something is becoming narrower, whether physically or metaphorically, often in a narrative or descriptive context.
Example: "The path became more treacherous as it narrowed, forcing the hikers to tread carefully."
Alternatives: "as it constricted" or "as it tightened".
EarthLink eliminated the agency as it narrowed an account review.
The report also found that the achievement gap between white and minority students grew on the national test from 1994 to 1998, even as it narrowed on state test results.
It is also the first significant campaign corruption case evolving out of the Supreme Court's Citizens United decision, which opened up new channels for the wealthy to pour money into campaigns even as it narrowed the constitutional definition of political corruption and made it harder for prosecutors to prove bribery.
Additionally, the head of the river-forecasting for the weather service of North Dakota and Minnesota attributed the rise of the Red River moving faster and higher than previously expected due to the sandbag levees that residents built to protect their homes, as it narrowed the channel of the river.
Reports recently surfaced that Intel's fund, the largest of its kind, might sell up to $1 billion of its holdings as it narrows its strategy under its chief executive, Brian M. Krzanich.
As it narrows its search for a new director, the continuously in-flux Museum of Contemporary Art Detroit on Thursday said it has selected architects for renovations.
As it narrows the productivity gap with America, its exchange rate, adjusted for inflation, will tend to rise.
It marks an evolution in China's growth model, as it narrows the technological gap with leading economies and shifts more of its resources into services.
It both emboldens the blood, just as it narrows the mind The problem, as Mr. Drudge gleefully pointed out, is that Shakespeare didn't write it.
They did Hathersage and Padley Chapel; Calke Abbey and Staunton Harold; Dove Dale, as it narrows and deepens to Milldale; Lathkill Dale from Alport to Ricklow Quarry; Cromford Canal and the High Peak Trail.
Climb the small observation tower for a picturesque 360-degree view of grain elevators (a Buffalo invention) on the placid Buffalo River, an 1833 lighthouse, and the final expanse of Lake Erie as it narrows to become the Niagara River.
