Final answer:
The counter-jinx to Levicorpus in the Harry Potter series is Liberacorpus, which reverses the spell's effect and safely lowers a person to the ground.
Step-by-step explanation:
The counter-jinx for Levicorpus is Liberacorpus. Levicorpus is a spell used in the Harry Potter series that lifts the target into the air by their ankle. To reverse this effect and safely lower the person back to the ground, one would use Liberacorpus. This spell is part of the fictional magic system created by J.K. Rowling in her series of books about the young wizard, Harry Potter. The counter-jinx is not found in academic textbooks but within the lore of the series, and is part of a larger collection of magical jinxes, hexes, and charms.
Levicorpus is a jinx that causes the target to be hoisted into the air by their ankle. It was created by Severus Snape and is one of the spells used in duels. Liberacorpus is the counter-jinx that releases the target from the Levicorpus spell and returns them to the ground.