From Middle English *overfillen, oferfüllen, from Old English oferfyllan (“to cram, overfill”), equivalent to over- +‎ fill. Cognate with Middle Low German overfullen, German überfüllen, Danish overfylde, Swedish överfylla.

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overfill (third-person singular simple present overfills, present participle overfilling, simple past and past participle overfilled)

1. To fill beyond capacity or beyond what is appropriate.

overfill (plural overfills)

1. An instance of overfilling.