突
トツ, カ, つ.く

stab, protruding, thrusting, thrust, pierce, prick

JLPT3 G7 S8 F521

穴# hole + 犬 dog/beast → hole from which a dog/beast suddenly springs → *thrust*; *protrude*; *frontal assault*; *attack*; *sudden* → *stab*; *prick*; *pierce*; *strike*; *push* → *push through*. For "protrusion," compare 凸 and 出.

[Full Kanji Etymology List]