KanjiJLPT N4
Rouse

rouse, wake up, get up

Mnemonic

A snake lies coiled on the path, dead asleep. You run right past it, and the pounding of your steps rouses the creature instantly. Eyes snapping open, the snake lunges forward. Now you really have to run—it's fully roused and furious, slithering after you at terrifying speed!
Additional thoughts
Picture the vibration of running feet traveling through the ground into the coiled snake, jolting it awake. The cause-and-effect is clear: running triggers rousing. The snake chasing you reinforces both radicals in a loop of panic.
Quick recall
Your running footsteps rouse a sleeping snake that chases you in fury.

Details

The keyword for 起 is rouse. This kanji conveys the idea of getting up, rising, or being stirred into action from a state of rest or inactivity. It encompasses both the physical act of waking up or standing up and the more figurative sense of arousing, initiating, or triggering something into motion. It is often associated with the beginning of an event or the起point from which something originates or occurs.
On'yomi
Kun'yomi
お.きる、お.こる、お.こす、おこ.す、た.つ