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Classic usage
Reading level: hard
Estimated CEFR level: B2 — Upper-Intermediate
Estimated from word frequency; not an official CEFR classification.
From rare Middle English strengthenen (14th c.), from earlier strengthen (12th c.), where -en is the infinitive ending. Probably the original form was reinterpreted as strength + -en around the time when the infinitive ending was being apocopated in late Middle English.
beef up, fortify
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Classic usage
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