To rise and move in a billowing or swelling manner, To move like advancing waves, To improve one's performance suddenly, especially in bettering one's standing in a competition, verb_ To accelerate forwards, particularly suddenly, rise rapidly, rise and move, as in waves or billows, noun_ a sudden forceful flow, A sudden rush, flood or increase which is transient, A large wave or billow; a great, rolling swell of water, produced generally by a high wind