The receipt nobody knew they were signing, frozen forever the second you hit the keys.
means A captured still image of whatever is currently displayed on a screen, saved as a file you can keep, share, or use as proof.
from A straightforward compound of "screen" and "shot." "Screen" traces back through Old French "escren" to a Germanic root meaning a shield or protective cover — a thing you put between yourself and fire or wind — which over centuries drifted to mean a flat surface for displaying images. "Shot," in the photographic sense of a captured image, comes from the language of cameras (as in "a good shot"), itself borrowed from shooting and aiming. "Screenshot" is a child of the computer age, coined once screens became things worth freezing — a word that simply welds the surface to the act of capturing it.