godan verb (-mu), intransitive verb
A gentle, often literary or poetic verb for smiling. Less common in everyday speech than 笑う (わらう), but still used in modern Japanese, especially in written or formal contexts.
彼女は静かに笑んだ。
She smiled quietly.
赤ん坊が夢の中で笑んでいる。
The baby is smiling in its sleep.