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inoh

lose one's train of thought

/ˌluz wʌnz ˈtɹeɪn əv ˈθɔt/

To forget what you were saying or thinking because of an interruption.

“The fire alarm made the professor lose her train of thought mid-lecture.”
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Illustration of lose one's train of thought: To forget what you were saying or thinking because of an interruption.