Etymology
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topple (v.)

1580s, "tumble down, fall headfirst," earlier "tumble or roll about" (1540s), from top (v.) "to tip" + frequentative suffix -le. Transitive sense also is from 1590s. Related: Toppled; toppling.

updated on February 12, 2014

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Definitions of topple from WordNet

topple (v.)
fall down, as if collapsing;
Synonyms: tumble
topple (v.)
cause to topple or tumble by pushing;
Synonyms: tumble / tip
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.