Buying the dip is what we do when we DCA. The idea of DCA is so that one doesn't miss out completely buying cheap. Since we aren't sure where a bottom will occur except on hindsight, that's why we systematically buy in by buying in bits with expectations that price could fall further. It's not that buying the dip is another strategy on its own than DCA – Dollar Cost Average. It's just the same thing Forex traders do called "martingale" where trades are triggered at every drop-down (ongoing loss) with expectations to compound profit once price reverts. I hope my explanation helps.