What is Third-degree Instruction?

Legal Definition
An instruction given by a court to a deadlocked jury to encourage it to continue deliberating until it reaches a verdict. Also called Allen charge, dynamite charge, nitroglycerine charge, and shotgun charge.
Illustrative caselaw
See, e.g. U.S. v. Hill, 334 Fed.Appx. 640 (5th Cir. 2009) and Allen v. U.S., 164 U.S. 492 (1896).
See also