loosened

They won’t get this jumble loosened up in an hour.

In this passage he proposed to drive a level as they do in mines; this level would bring the two prisoners immediately beneath the gallery where the sentry kept watch; once there, a large excavation would be made, and one of the flag-stones with which the gallery was paved be so completely loosened that at the desired moment it would give way beneath the feet of the soldier, who, stunned by his fall, would be immediately bound and gagged by Dantès before he had power to offer any resistance.