The verb is pronounced /oʊvə(r)θroʊ/. The noun is pronounced /oʊvə(r)θroʊ/.
( overthrew, overthrown)
When a government or leader is overthrown , they are removed from power by force.
That government was overthrown in a military coup three years ago.
...an attempt to overthrow the president.
VERB : be V-ed , V n
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Overthrow is also a noun.
They were charged with plotting the overthrow of the state.
N-SING : oft N of n