呕吐
ǒutù · HSK 7
to vomit
🤮 呕 retch + 吐 spit-out; both carry the 口 mouth radical
Both characters share the 口 (mouth) radical because vomiting comes out the mouth. 吐 is 口 mouth + 土 earth (tù = spit out); pair it with 呕 (ǒu = retch) and you get the full heave-and-barf compound.
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.