steepen

v.变得更陡峭

steam-ship, steam-shovel, steamboat, steamer, steamgauge, steaminess, steamroller, steamship, steamy, steed, steel, steel band, steel wool, steel worker, steel-plated, steeliness, steelworks, steely, steelyard, steep, steepish, steeple, steeplechase, steeplechaser, steeplejack, steeply, steepness, steer, steerage, steerage-way, steerer, steering, steering committee, steering lock, steering-column, steering-wheel, steersman, stein, stellar, stem,