吁 Strokes Write it Listen 吁 xū alas; to sigh HSK 7–9 6 strokes Radical 口 Sound + meaning 1 word Built from口meaningkǒumouth; entrance, gate, opening于soundyúat, in, on; to, from; alas! How it works口 hints at the meaning (mouth), and 于 yú hints at the sound.