The preflop raiser betting again on the flop.
The opponent usually hasn't made a hand yet, so even a hand with nothing (Air) often gets through. But only bet when the board favors the raiser's range (for example, Q-high or higher and dry) and the opponent is a player who folds. In pots of three or more, bet only Strong and Draw. Example. QJ on K♠ 8♦ 3♣ is a dry K-high board, so bet 3.3 into 10 (33%) once, and if called, check the turn and river.