吐
tǔ · HSK 5
to spit
🤮 口 mouth + 土 tǔ (phonetic) = sounds coming out of the mouth
Left radical 口 means mouth; right side 土 (tǔ, earth) supplies the sound. Together: things the mouth expels — words when articulating, vomit when sick. The 土 phonetic gives you the pronunciation tǔ directly.
吐 — mouth radical 口 + earth 土 (phonetic)
吐 is a phonosemantic compound: 口 (mouth) gives the meaning—an action done with the mouth—while 土 (tǔ) supplies the sound. Originally it meant to spit out or expel from the mouth, and it still covers spitting, vomiting, and by extension uttering or pouring out words.