Etymology
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retrain (v.)

also re-train, "train again, teach (someone already skilled or trained) a new skill," 1905, from re- "back, again" + train (v.). Related: Retrained; retraining.

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Definitions of retrain

retrain (v.)
teach new skills;
We must retrain the linguists who cannot find employment
retrain (v.)
train again;
He is retraining to become an IT worker
From wordnet.princeton.edu