with obj.
1
- tip (something) over so that it is on its side or upside down打翻; 掀翻：
the crowd proceeded to overturn cars and set them on fire.
人群接着把汽车掀翻并点火烧车。
1.1
- no obj. turn over and come to rest upside down, typically as the result of an accident翻仰过来：
a coach hit a car and overturned.
大客车撞上了一辆轿车后翻仰在地。
2
- abolish, invalidate, or turn around (an established fact, system, etc.)推翻（既定事实、体制等）; 使无效：
the results overturned previous findings.
结果推翻了先前的发现。
2.1
- reverse (a legal decision)推翻（判决）：
he fought for eight years to overturn a conviction for armed robbery.
为了推翻持械抢劫的判决他奋斗了八年。
1
- rare an act of turning over or upsetting something; a revolution, subversion, or reversal〈罕〉推翻, 颠覆; 翻转; 革命。
1.1
- mass noun Ecology the occasional (typically twice yearly) mixing of the water of a thermally stratified lake【生态】（尤指水温分层的湖水每年两次的）湖水对流。