from the GNU version of the Collaborative International Dictionary of English
- n. a bullet which will produce a sufficient shock to stop a soldier advancing in a charge; specif., a small-caliber bullet so modified as to expand when striking the human body, producing a severe wound which is also difficult to treat medically. Types of bullets called hollow-nosed bullets, soft-nosed bullets and hollow-point bullets are classed as man-stopping. The dumdum bullet or dumdum is another well-known variety. Such bullets were originally designed for wars with savage tribes.
Sorry, no etymologies found.