John speaks of what he is hearing as if it were like the sound made by a very large crowd of people, a large body of rushing water, and very loud thunder. (See: [[rc://en/ta/man/jit/figs-simile]])
This word means "Praise Yahweh." Some modern versions translate it as "Praise the Lord." See how you translated this in [Revelation 19:1](../19/01.md).