What is the meaning of overthrow?

noun

• The termination of a ruler or institution (especially by force. )
• The act of disturbing the mind or body.
  • usage: "his carelessness could have caused an ecological upset"; "she was unprepared for this sudden overthrow of their normal way of living"
  • synonyms: upset, derangement

verb

• Cause the downfall of; of rulers.
  • usage: "The Czar was overthrown"; "subvert the ruling class"
  • synonyms: subvert, overturn, bring down
• Rule against.
  • usage: "The Republicans were overruled when the House voted on the bill"
  • synonyms: overrule, overturn, override, reverse