Often carries disapproval — the leaver is dismissive, rude, or irresponsible (hit-and-run drivers, people walking out of fights). Very rarely neutral. Don't use it for someone simply leaving politely.
memory
扬 (to raise, to lift) + 长 (long, here implying 'long strides'): literally 'lifting long strides and going.' Picture someone marching away with exaggerated, unconcerned steps.
