in that day: verses: Isaiah 27:12; Isaiah 27:13 refer to Israel, as verses: Isaiah 27:7; Isaiah 27:10-11 refer to Israel's enemies.
beat off: i.e. as olives from. tree. "beat off [his fruit]": i.e. gather the sons of Israel.
channel. flood.
river: i.e. the Euphrates.
children. sons.