What is the meaning of backlash?

noun

• A movement back from an impact.
  • synonyms: recoil, repercussion, rebound
• An adverse reaction to some political or social occurrence.
  • usage: "there was a backlash of intolerance"

verb

• Come back to the originator of an action with an undesired effect.
  • usage: "Your comments may backfire and cause you a lot of trouble"
  • synonyms: backfire, recoil