Completely unexpected and odd.
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Completely unexpected, surprising, or unrelated to what was being discussed.
When something comes out of left field, it catches people off guard because no one saw it coming.
It's used for ideas, comments, or events that seem random or sudden.
"Out of the Blue"
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Sudden and unexpected — out of left field also implies the idea seems strange or random
"Under Your Nose"
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Something happening right in front of you unnoticed — not about being unexpected
"Out of Left Field"
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Something completely unexpected that catches everyone off guard