asustar
/asusˈtaɾ/ · A2 · verb
to scare, to frighten, to spook
👻 a-SUS-tar: something sus gives you a scare
The middle syllable is sus, like English slang for suspicious. Something sus spooks you. Etymology: a- + susto (a fright, a scare) + -ar, so asustar is literally to give someone a susto.