Waiting in line is much more common than waiting on line, which is a phrase largely local to the New York City region. Both communicate the same meaning.
The International Date Line
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JayRayZay (@zaidahoe) / X
Waiting in line [gif] : r/funny
Are you waiting 'in line' or 'on line'? : r/AskAnAmerican
Andi Kisner
LINE|always at your side.
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Caliban's Island
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Caliban's Island