The incantation Relashio is used to make something relinquish its hold on another object.

From the Story

Harry Potter and the Goblet of Fire

Discovered in chapter 26, The Second Task

Harry uses Relashio against the Grindylows whilst he is in the lake, which has a slightly different effect than when performed on land. Instead of sending sparks at the Grindylows, Harry ends up pelting them with what seems to be a jet of boiling water, which causes angry red patches to appear on their skin.

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