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.
Pictures at the Lewes derailment have shown how the force of the train leaving the tracks had flattened trees and left a piece of track strewn across the embankment.
From BBC ● Aug. 14, 2026
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
By the morning of Feb. 15, his good spirits had flattened to just “OK.”
From Los Angeles Times ● Mar. 10, 2022
His hair had flattened out, and it fell in his eyes.
From "Eleanor & Park" by Rainbow Rowell
