The story
From the metaphor of a fishhook: the deity of Christ (the "hook") hidden within his humanity (the "bait"), which Satan accepts as ransom for humanity.
Etymology from Wiktionary, CC BY-SA 4.0.
fish-hook theory
Today it means: A Christus Victor theory of atonement associated with Gregory of Nyssa, in which Satan is tricked into accepting Christ's humanity as ransom, thereby being caught by his divinity. Full definition →