hatto
A sudden jolt of realization or surprise that makes your body react — gasping, eyes widening. An involuntary physical startle response.
💡Remembering you left the stove on — 'I was hatto when I realized I forgot to lock the door.'
忘れ物に気づいてはっとした。
I was hatto startled when I realized I forgot something.
I was ___ when I realized the meeting was in five minutes.
会議まであと5分だと気づいて○○した。