捅
tǒng · HSK 7
to stab
🔪 扌(hand) + 通 tōng (pass through) = a hand pushing through; tǒng pokes a hole right through
The 扌 hand radical carries the action while 通 tōng supplies the sound and the sense of going clean through. A poke or stab that breaks the surface and passes to the other side.
捅 — hand radical 扌 + 甬 (yǒng, phonetic)
捅 is a phono-semantic compound. The hand radical 扌 signals an action done with the hand, while 甬 supplies the sound (related to tǒng/yǒng). It means to poke, jab, or thrust, extended figuratively to 'stir up trouble' or 'let out a secret.'