Common term in crypto, referring to an investment strategy. Instead of trying to predict when/if the market is up or down and buying accordingly, the DCA strategy suggest to simply split your investment into smaller investments which you perform over time independent of the current market conditions. By doing so, you will most likely not get the best price but you will get an average price. With the volatility of crypto this can be a good strategy to reduce regret of having missed the ATL or having bought at an ATH. If someone suggests you to DCA down, they mean that you should frequently buy smaller portions while the price of a token is on a downwards trend instead of gambling on hitting the lowest point.