# His breath is like an overflowing torrent

This compares the air coming out of Yahweh's mouth to a flood to emphasize its power to destroy. 

# to sift the nations with the sieve of worthlessness

"Yahweh will separate and destroy the wicked people of the nations"

# sieve of worthlessness

"sieve that gets rid of what is worthless." Many modern translations read, "sieve of destruction."

# a bridle in the jaws of the peoples

"a bridle on the heads of the peoples" or "a bit in the jaws of the peoples"