συμπληρόω

Luke 8:23 συνεπληροῦντο they were being swamped

As they sailed, He fell asleep, and a windstorm came down on the lake, so that the boat was being swamped, and they were in great danger.

Luke 9:51 συμπληροῦσθαι completing

As the day of His ascension approached, Jesus resolutely set out for Jerusalem.

Acts 2:1 συμπληροῦσθαι arriving of

When the day of Pentecost came, they were all together in one place.