flatten
verb (used with object)
to make flat.
had flattened
-
past perfectof flatten.past perfect
Used to express a completed action that took place before another specific past action occurred.
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
America’s shale industry was starting to become an afterthought—production had flattened and was expected to decline.
From Barron's ● Mar. 27, 2026
While the number of air passengers flying into nearby airports during ski season continued to rise at Vail, Aspen and Jackson Hole following the pandemic, they had flattened in Telluride.
From The Wall Street Journal ● Mar. 1, 2026
It is not clear how many houses were destroyed in Chilobwe, but we saw huge piles of boulders and trees that had flattened people's houses.
From BBC ● Mar. 17, 2023
By Wednesday, any wave had flattened out into a ripple.
From Reuters ● Nov. 9, 2022
The walking had been easy so far; after he had climbed over the mountain nearest Ch’ulp’o, the terrain had flattened out into endless rice fields.
From "A Single Shard" by Linda Sue Park
