The term 'Stick a Fork in' is an idiom that means to declare something finished or done. It is often used when referring to a task or project that has been completed. The crossword solutions for this term are SPEAR (5 letters) and STAB (4 letters). A SPEAR is a long pole with a sharp point at one end, while to STAB is to thrust a pointed object into something. Both of these words can be used to describe the action of sticking a fork in something.