Walk-the-line definitions

(idiomatic) To maintain an intermediate position between contrasting choices, opinions, etc.
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(idiomatic) To behave in an authorized or socially accepted manner, especially as prescribed by law or morality; to exercise self-control.
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To mark or secure a boundary by walking along it.
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(idiomatic, US, education) To participate in the procession at a graduation ceremony; to graduate.
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