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had been crumbling
  • past perfect progressive of crumble.

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.

When COVID-19 took hold in the United States, the country’s public health infrastructure had been crumbling for years.

From The Verge • Jun. 3, 2021

My ramshackle mental defences had been crumbling for a while.

From Nature • May 7, 2018

After the riot, this corner parcel was the site of an abandoned school that had been crumbling, which was torn down after a girl playing in the ruins was struck by a falling brick.

From Washington Times • May 8, 2016

But even before the Libby indictments, the wall of silence had been crumbling.

From Time Magazine Archive

Since the beavers had left, the dam had been crumbling and loosening gradually, until it had become just a question of time before it would give way altogether, and drain the flooded land behind.

From "The Incredible Journey" by Sheila Burnford