i'm not an expert level trader but the bad guys ( short sellers ) literally borrow shares betting the stock price will go down then they sell them lower and make money.
at some point if the stock goes higher their brokers do what's called a margin call where they have to buck up and pay for the shares they borrowed only now the price goes higher and we the long term holders gain value since they are buying at a much higer price.
so in regards to setting the sell order of your shares very high , then those shares in the current channels are essentially unavaiable for anyone to borrow once you have a commited order to sell in. They are off limits until that price is reached
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