top•plePronunciation: (top'ul), [key]
—v., -pled, -pling.
to fall forward, as from having too heavy a top; pitch; tumble down.
to lean over or jut, as if threatening to fall.
to cause to topple.
to overthrow, as from a position of authority: to topple the king.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.