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to become brilliant; to become cheerful
彼女が来て場が華やいだ。
Her arrival brightened up the room.
春になると庭が色とりどりの花で華やいでいる。
In spring, the garden becomes brilliant with colorful flowers.
花が満開になり、公園が華やぐ季節がやってきた。
The season when flowers bloom and the park brightens up has arrived.