1. to flash (e.g. lightning), to flicker, to glitter, to sparkle, to gleam

Godan verb with 'ku' ending intransitive verb word usually written using kana alone

2. to flutter (e.g. flag), to wave, to undulate

intransitive verb Godan verb with 'ku' ending word usually written using kana alone

3. to flash into one's mind (e.g. an idea), to come to one suddenly

intransitive verb Godan verb with 'ku' ending word usually written using kana alone