See topple in Webster's New World Roget's A-Z Thesaurus II
verb
To turn or cause to turn from a vertical or horizontal position:
capsize, knock over, overthrow, overturn, turn over, upset. See change, horizontal, moveTo come to the ground suddenly and involuntarily:
drop, fall, go down, nose-dive, pitch, plunge, spill, tumble. Idiom: take a fall (or header) (or plunge) (or spill) (or tumble). See riseTo bring about the downfall of:
bring down, overthrow, overturn, subvert, tumble, unhorse. See helpTo undergo capture, defeat, or ruin:
collapse, fall, go down, go under, surrender. See resist, win
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