stab, protruding, thrust, pierce, prick, collision, sudden
突 centers on a forceful, sudden outward motion: thrusting, stabbing, or piercing, and by extension anything that protrudes or happens abruptly, like a collision.
突 combines 穴 (hole, cave) and 犬 (dog). The traditional explanation is a dog suddenly bursting out of a cave, giving the sense of thrusting or sudden emergence.
A dog (犬) suddenly shoots out of a cave (穴), thrusting forward and piercing the air. That sudden, protruding motion is the core of 突.
For トツ, imagine the dog bursting out with a sharp 'tots!' sound, like a sudden thrust: tots -> トツ.
abrupt; sudden; unexpected
breaking through; breakthrough; penetration
collision; crash; impact; running into
rushing into; breaking into; storming
to poke (repeatedly, lightly); to nudge
to prick; to stab
thrust; stab; lunge; pass (in fencing)
abrupt; sudden
suddenly; all of a sudden; unexpectedly
to thrust (something) into (something); to cram; to stuff; to shove
crash; smashing (into); ramming; (violent) collision
projection; protrusion; jutting out; sticking out
protuberance; projection; prominence; protrusion; bump; boss; process; apophysis
chimney; smokestack; funnel (of a ship); stovepipe
rear-end collision
rush; dash; charge
gust (of wind); blast
to stab; to stick; to pierce; to thrust
charging (at the enemy) with a shout; rush
to pierce through; to break through
prop; strut; support; brace; bar
to defy; to disobey; to rebel against; to oppose; to resist
to push up; to thrust up; to stick up; to raise
to run into; to collide with; to crash into; to bump against