Ramp or Ramping, is when in a game utilizing resources, you spend the first portion of the game allocating or boosting resources before spending them. Giving you a distinct resource advantage later in the game. These strategies also use cards or abilities that boost the amount of production. Frequently used in card games like Magic the Gathering. But also seen in many other games, from RTS to Tactical RPG, Etc.
Ramping strategies often utilize stall tactics or control methods to handle early game aggression, preferring to wait it out, and make a large powerful strike, as opposed to quick, aggressive, smaller strikes.