godan verb (-ru), intransitive verb
be in full bloom; blossom in full glory
Describes flowers blooming abundantly and proudly, often with a sense of splendor. Used for seasonal flowers like cherry blossoms, roses, etc.
公園の桜が咲き誇っている。
The cherry blossoms in the park are in full bloom.
庭に色とりどりの花が咲き誇っていた。
Colorful flowers were blooming in full glory in the garden.