吐 means “vomit, spit, breathe out”

はく · haku

Also: belch, confess

Kun'yomi (Japanese reading)
はく, つく
On'yomi (Chinese reading)
ト

JLPT N1 · Taught in secondary school · 6 strokes

The story

A mouth (口) emptying onto the ground (土): spitting out. 吐く is to throw up or to breathe out, 吐き気 is nausea, 吐息 is a sigh, and 弱音を吐く is to let out a complaint, to admit you can't take it.

Used in 吐く (haku, to vomit/exhale), 吐き気 (hakike, nausea), and 吐息 (toiki, sigh)

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Readings from KANJIDIC2, © EDRDG, CC BY-SA.