This compound verb intensifies 'cleanse' with a prefix meaning 'through' or 'thoroughly,' suggesting complete purification. John the Baptist uses it metaphorically in both Matthew and Luke to describe the Messiah's coming work: he will 'thoroughly cleanse his threshing floor,' separating wheat from chaff. The agricultural imagery of winnowing—throwing grain into the air so wind removes the chaff—becomes a powerful picture of final judgment and purification. The 'thoroughly' aspect is critical; this isn't partial cleaning but complete clearing. Spanish 'limpiará' and French 'nettoyer' capture the cleansing sense, while the context demands understanding the complete, final nature of this purging action.