Trade or Fade Rule
An option exchange rule that prevents the occurrence of a trade through.
Investopedia Commentary
If a better bid is posted on another exchange for an option and a market maker is unwilling or unable to match it for a client order, the market maker may offer to trade with the other market maker. The market maker offering the better price must accept the offer and trade at the price offered or adjust the bid.
See also: Bid, Exchange, Market Maker, Securities and Exchange Commission - SEC, Trade Through