συμπληρώνω

Etymology: From the prefix συν- (syn-, meaning 'together, with') + πληρώνω (plirono, 'to fill, to pay'). The root πλήρης (pliris) means 'full, complete' and is cognate with English 'full' and 'plenty' through Proto-Indo-European *pleh₁-. The compound literally means 'to fill together' or 'to make complete by filling.' This verb emphasizes the collaborative or additive nature of completion, distinguishing it from simple filling.