Sobreseimiento: is the action of sobreseer, It‘s when a Judge shelves/stay the investigation of a crime because he don´t find evidence.
Quitamiedos: It’s a metallic fence placed in the side of the road to avoid that the vehicles leave.
if you have found the word “pelotazo” in a Spanish newspaper, is possible that the definition is not same that our Sanz friend has written, if you write a little context we will be able to know it.
Regards.