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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
The noun is derived from switch (“to turn (a train) from one railway track to another using a switch”, verb) + back (“so as to reverse direction and return”, adverb). The verb is derived from the noun.
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Classic usage
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Verbault — Brown corpus levels, WordNet definitions, Gutenberg corpus.
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