Double damezumari
Double damezumari usually refers to the loss of a capturing race because one side requires approach moves on either side of a group.
In this example (from TFG9 Black Upper Left) White wins the race despite some apparently bad shape. Black will never be able to play safely at a, now. And the stones must be captured by Black before he can approach from the other direction.
This is a more conventional example from Kanazawa Problem 38 / Solution.
White has effectively captured the stones.