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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
Unknown. The verb is first recorded 1815; the noun, 1825. Compare Scots boost (“to move; drive off; shoo away”), bost, boast (“to threaten; scold”), Middle English boosten, bosten (“to threaten”). Possible doublet of boast.
encouragement
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tap / space
Classic usage
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