v. separate; break or wrench apart
Why did they sunder northern and southern Ireland politically and religiously?.
Sentence in Classic:
Stir up thy teeming breast, sunder the peace they have joined, and sow seeds of quarrel; let all at once desire and demand and seize on arms.
Here, where thou seest sundered piles of masonry and rocks violently torn from rocks, and smoke eddying mixed with dust, Neptune with his great trident shakes wall and foundation out of their places, and upturns all the city from her base.