• 突つく — to thrust; to poke
• 突撃とつげき — charge; assault
• 衝突しょうとつ — collision; conflict
• 突破とっぱ — breakthrough
• 突発とっぱつ — sudden occurrence
• 突如とつじょ — suddenly; abruptly

突 combines the radical 穴 (hole) with 犬 (dog). The image is of a dog suddenly bursting out of a hole — symbolizing a sudden thrust or action. It captures the essence of energy breaking through barriers — just like in words such as 突破 and 突進.

Imagine a dog bursting out from a small hole — that’s the ancient image behind 突. The lower part was once 犬, later simplified into 大. It captures a sudden, powerful motion — something breaking free with force and energy.