Possible meanings are that Yahweh speaks of completely destroying the nations as if 1) he were harvesting all the grapes and all the grain or 2) he were harvesting quickly, while the grain and grapes are ripe. (See: [[rc://en/ta/man/jit/figs-metaphor]])
Yahweh speaks of making war against the nations as if he were using a sharp tool to harvest a field of ripe crops. If your readers will not understand the word "sickle," you may use the word for any sharp tool that your people use for harvesting. (See: [[rc://en/ta/man/jit/figs-metaphor]])
"Swing the sickle to cut the grain." This is a metaphor for a soldier using a sword to kill people, but it is best to use the word for a sharp tool used in harvesting. (See: [[rc://en/ta/man/jit/figs-metaphor]])
Yahweh speaks of the nations as if they were many grapes in a winepress, ready for people to crush them by stepping on them. Alternate translation: "Come, completely destroy the nations, for they are many, and they are helpless to resist you" (See: [[rc://en/ta/man/jit/figs-metaphor]])
Yahweh speaks of the nations' wickedness as if it were the juice that flows from the winepress into storage containers, and more juice flows into the vats than they can contain. (See: [[rc://en/ta/man/jit/figs-metaphor]])