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1. To lean or totter and fall over; to collapse. The strong winds caused a number of buildings in the city to topple over. Someone knocked into the old lady and she toppled over on the sidewalk.
2. To push or knock someone or something over from an upright position. In this usage, a noun or pronoun can be used between "topple" and "over." He ran right into a group of people and toppled them over. Please don't topple over my Lego castle! I spent all morning building it.
3. To fail or collapse. The company eventually toppled over under the weight of its staggering debt.
4. To defeat or ruin someone or some group. In this usage, a noun or pronoun can be used between "topple" and "over." The underdog team came from behind in the fourth quarter to topple over the returning champions. The tech company quickly toppled its competition over with its incredibly popular line of smartphones.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
[for something very tall] to fall over. I was afraid that Jimmy's stack of blocks would topple over. The stack of books toppled over and ended up as a jumbled mess on the floor.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.