'Curved' in the Bible

And I saw a white cloud, and on the cloud I saw one seated, like a son of man, having on his head a crown of gold, and in his hand a sharp curved blade.

And another angel came out from the house of God which is in heaven, having a sharp curved blade.

And another angel came out from the altar, who has power over fire; and he gave a loud cry to him who had the sharp curved blade, saying, Put in your sharp blade, and let the grapes of the vine of the earth be cut; for her grapes are fully ready.