What is the meaning of recoil?

noun

• The backward jerk of a gun when it is fired.
  • synonyms: kick
• A movement back from an impact.
  • synonyms: repercussion, rebound, backlash

verb

• Draw back, as with fear or pain.
  • usage: "she flinched when they showed the slaughtering of the calf"
  • synonyms: flinch, squinch, funk, cringe, shrink, wince, quail
• 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, backlash
• Spring back; spring away from an impact.
  • usage: "The rubber ball bounced"; "These particles do not resile but they unite after they collide"
  • synonyms: bounce, resile, take a hop, spring, bound, rebound, reverberate, ricochet
• Spring back, as from a forceful thrust.
  • usage: "The gun kicked back into my shoulder"
  • synonyms: kick back, kick