godan verb (-ku), intransitive verb
Describes something like a flag, cloth, or hair moving lightly and repeatedly in the wind.
旗が風にはためいている。
The flag is fluttering in the wind.
godan verb (-ku), intransitive verb
Formal or literary use for sounds like thunder echoing or resounding through the air.
雷鳴が山々にはためいた。
The thunder reverberated through the mountains.