Hypertext Webster Gateway: "toppling"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
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.
Though castles topple on their warders' heads. --Shak.
From WordNet (r) 1.7 (wn)
toppling
adj : falling over as if from top-heaviness or lack of support; "a
toppling pile of books"; "toppling empires"
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