Double Up
  
Doubling up is just like doubling down, basically: it means that, when you’re an investor, you double your stake in an investment you have. Meaning you went from knee-deep in the pool of that investment to chest-deep (whoooo, those are cold, risky waters).
Someone might decide to double up when...counterintuitively, maybe...the investment takes a dip southwards. By doubling up, the investor hopes that they’ll reap double the rewards when (of, if…) the investment goes back up.
As Warren Buffett once said, "be fearful when others are greedy and greedy when others are fearful.” In other words, double up, buttercup; time to make some gains on this loss.