吞
tūn · HSK 6
to swallow
💊 天 sky over 口 mouth — the whole sky drops in
The character stacks 天 heaven on 口 mouth. Swallowing is so total even the sky fits down the throat. Sound: tūn rhymes with tuna, another thing swallowed whole.
吞 — 天 (sky) on top + 口 (mouth) below
A semantic-phonetic compound: 口 (mouth) gives the meaning 'to swallow,' while 天 (tiān) hints at the sound. The image is of something going down through the mouth, extended from 'swallow whole' to figurative senses like 'engulf' or 'annex.'