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"breakdown" is also used as a crossword clue. If that's what you saw, the answer is often decomposition (13 letters).
Definitions
the act of disrupting an established order so it fails to continue
Word origin
Deverbal from break down.
Used in a sentence
“Whenever he was behind the wheel, he would panic at the first sign of a breakdown.”
“He declared that these drastic steps would undoubtedly inconvenience a good many people, but the alternative was bankruptcy of the Ulster Transport Authority and the breakdown of public transport services.”
“We saw a breakdown by the side of the road.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer2 curated clues
01“Mechanical failure”9 letters
02“System failure”9 letters
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