Idiom Breakdown

fall in line

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Definition

To submit to the rules of a higher authority; obey; conform.

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In Context

"It will be to your interest to accept my suggestions and fall in line with my plans."
"If I had your life I'd put my throat to a knife, Fill your days with emptiness, but I don't have the time; I won't grow up, I won't fall in line."

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Also Said As

knuckle under