When a Piece or Pawn is in a situation to be taken by the enemy, it is said to be en prise. To put a piece en prise, is to play it so that it may be captured.
[My son] he loves music, but right now, cars are his thing. He told me when he gets older he wants to be a "Ferrari man" and I was like, "A Ferrari man? Do you want to drive Ferraris or do you want to build them?" He was like, "I want to build them. "