v. i. [ imp. & p. p. Toppled p. pr. & vb. n. Toppling. ] [ From Top summit. ] To fall forward; to pitch or tumble down. [ 1913 Webster ]
Though castles topple on their warders' heads. Shak. [ 1913 Webster ]
v. t. To throw down; to overturn. [ 1913 Webster ]
He topple crags from the precipice. Longfellow. [ 1913 Webster ]