A “limp-raise” in poker refers to the act of initially limping in (just calling the big blind) pre-flop, and then raising when the action comes back to you after an opponent has raised.
This is typically a move made with a very strong hand. The player who is limp-raising is trying to induce a raise from one of the players who act after them, with the intention of then re-raising when the action returns.
For example, let’s say you’re in early position and you’re dealt pocket Aces, a very strong hand. Instead of raising right away, you simply call the big blind (you “limp in”). A player acting after you raises, and when the action comes back to you, you raise (you “limp-raise”).
The strategy behind the limp-raise is to build a bigger pot while disguising the strength of your hand. However, it’s generally considered an advanced play and can be risky, especially against experienced players, as it can be an obvious sign of a strong hand. It’s a move that needs to be used sparingly and in the right situations, to avoid becoming predictable.