差し

Etymology 1
The

Noun

 * 1) the act of shining on something, such as sunlight
 * 2) the act of becoming apparent on the surface of something, such as blushing
 * 3) the act of sticking something onto something else to apply, such as lipstick
 * 4) the act of sticking something upwards and holding it, such as an umbrella
 * 5) the act of sticking something through one's sash and wearing it, such as a katana

Etymology 2
.   The longer form first appears in texts from the late 1500s during the late, while the clipping first appears from 1765.