Origin

The character 斜 combines two components to show something tilted or angled. On the right, the radical 斗 (a measure or container shape) provides a classification related to things that can be measured or positioned. On the left, 余 acts as a sound hint for the pronunciation シャ, telling you roughly how to say the character rather than adding to its meaning. Together, these parts created a character meaning "diagonal" or "slanting" — something that isn't standing straight but is positioned at an angle.