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Definition

Violating rules or decorum; out of bounds.

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Origins

From go off the reservation.

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Also Said As

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Related Idioms

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off the hook

Performing extraordinarily well.

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off one's own bat

At one's own instigation, of one's own accord.

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off the bat

From the start; immediately; right away.

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off the wagon

No longer maintaining a program of self-improvement or abstinence from…

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off the radar

Unlikely to happen or be important in the near future, or tending to e…

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off the deep end

Crazy, erratic, or irrational.
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How People Actually Use It

Crazy, as used in "Wedding Crashers".

"I'm terrified of this girl. She's completely off the reservation."

Source: Urban Dictionary

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