Paul uses anapleroo in 1 Corinthians 16:17 when the Corinthians "made up for" his absence through Stephanas and others, and in 1 Thessalonians 2:16 of the Jews who were "filling up" (completing) the measure of their sins. Galatians 6:2 ("bear one another's burdens, and so fulfill the law of Christ") uses the concept — the community completing what each individual lacks. Matthew 13:14 uses it of fulfilled prophecy. The word captures the corporate, completing nature of the body of Christ.
Anapleroo means to fill up to full capacity — to supply what is missing to make complete. The ana prefix intensifies pleroo (fill), suggesting thorough, overflowing completion. Used of completing tasks, supplying deficiencies, and fulfilling prophecy.