In many European countries cattle have to be stunned before slaughtering.
To hit the cue ball so that it slides without topspin or backspin (and with or without sidespin) and continues at a natural angle after contact with the object ball
If you are stunned by something, you are extremely shocked or surprised by it and are therefore unable to speak or do anything. Many cinema-goers were stunned by the film's violent and tragic end. + stunned stunned When they told me she had gone missing I was totally stunned
If something such as a blow on the head stuns you, it makes you unconscious or confused and unsteady. Sam stood his ground and got a blow that stunned him. see also stunning