What is the meaning of Recoil?

A starting or falling back; a rebound; a shrinking.

The state or condition of having recoiled.

The energy transmitted back to the shooter from a firearm which has fired. Recoil is a function of the weight of the weapon, the weight of the projectile, and the speed at which it leaves the muzzle.

An escapement in which, after each beat, the scape-wheel recoils slightly.

To pull back, especially in disgust, horror or astonishment.

To retreat before an opponent.

Of a firearm: to quickly push back when fired.

To retire, withdraw.

Source: wiktionary.org