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  1.                 From The Collaborative International Dictionary of English v.0.48:
                    

    Topple \Top"ple\, 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]