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had been doubling
  • past perfect progressive of double.

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.

The cells had been doubling every day, Thompson said.

From The New Yorker • Jul. 15, 2019

At the time, Woodman asserted that GoPro’s revenue had been doubling every year, to $500 million in 2012.

From BusinessWeek • Mar. 13, 2014

And then Nina, who had been doubling all the while, broke, too.

From The Tigress by Warner, Anne

The others, however, discovering that Alfred's party had been doubling and twisting through the worst country, detached a single rider, whose business it was to search out the directest and easiest route.

From The Westerners by White, Stewart Edward

The next paragraph instructed him to place the young woman who had been doubling for Miss Gay in the position which Miss Gay would leave vacant.

From Jean of the Lazy A by Bower, B. M.