突入 （トツニュウ） rushing into, breaking into, storming, plunging into (war, etc.), embarking on (a new venture)

突然 （トツゼン） abrupt, sudden, unexpected

強制衝突 （キョウセイショウトツ） collision enforcement

非弾性衝突 （ヒダンセイショウトツ） inelastic collision

突く （つく） to prick, to stab, to poke, to prod, to push, to thrust, to nudge, to hit, to strike, to use (a cane), to prop oneself up with, to press against (the floor, etc.), to attack, to brave (the rain, etc.)

突棒 （つくぼう） barbed T-shaped weapon for catching thieves (Edo period)

麦突 （むぎつく） Pungtungia herzi (species of cyprinid)

剣突く （けんつく） rough scolding, upbraiding, tongue-lashing, dressing-down