The kanji 吐 primarily means "to spit," "to vomit," or "to exhale." It refers to the act of expelling something from the mouth or body. This can be either physical matter, like food or saliva, or metaphorical, referring to expressing feelings or opinions. It always relates to the action of expelling something outwards.

・On-yomi (音読み): ト (to) ・Kun-yomi (訓読み): は（く） (ha(ku))

⚫︎吐く Translation: To spit; to vomit. ⚫︎吐血 Translation: Hemoptysis (spitting up blood). ⚫︎不平不満を吐く Translation: To voice complaints; to vent grievances.

The kanji 吐 is a phono-semantic compound (形声文字). The left side is the radical 口 (くち), meaning "mouth." The right side is 土 (つち), meaning "earth" or "soil," which also serves as the phonetic component, indicating the pronunciation of the character. Therefore, the formation suggests that the character is about something coming out from the mouth like the earth comes out from the soil.