shell-shocked

The term originated during World War I as a colloquial military description for what is now clinically known as combat stress reaction or post-traumatic stress disorder (PTSD). It literally combines "shell," referring to the explosive artillery projectiles that characterized trench warfare, with "shocked," meaning struck or profoundly disturbed. The logic is direct: soldiers were psychologically shattered by the relentless bombardment of shells. Over time, the term's usage broadened beyond the battlefield to describe anyone in a state of severe psychological disorientation resulting from any overwhelming trauma or surprise.

Structure: shell (projectile casing) + shocked (affected by sudden impact) shell: From Old English sciell (seashell, eggshell), related to scales. In this compound, it refers to artillery shells or bombs. shocked: From the past participle of shock, from French choquer (to strike, collide), of Germanic origin. It denotes being severely affected by a violent impact or disturbance.