Where did "shushing "the crowd come from?

You know, where the fighter puts his index finger up to his lips and goes "shhhh" like you do to a child.
I hate that shit.
I don't get why someone would to hush the crowd from cheering for their performance?
Whoever started that is on my list. Js
Boxers cant do it cos their gloves prevent it.

They are not shushing the crowd,they are silencing their haters and critics,and possibly the opponent who maybe ran their mouth
 
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