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break-in period

[ breyk-in ]
/ ˈbreɪkˌɪn /
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noun
a period during which certain restrictions or moderation in operating should be followed, as the avoidance of high speed, rapid acceleration, or severe braking for a new automobile.
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Which of the following nouns has an irregular plural form?
Also called break-in.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

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