rare. [f. prec. sb.]
1. trans. To move to and fro as in playing the trombone (humorous).
1879. Harlan, Eyesight, vi. 70. The age when we commence to trombone our newspaper in search of the receding near point of distinct vision.
1893. W. H. Hudson, Idle Days Patagonia, xi. The redskin is never observed to trombone his newspaper.
2. intr. To play the trombone; also transf. to make a sound like a trombone.
1839. Mrs. Gore, Courtier, etc., 280. Stick to your last, Nickel; and eschew the ambition of tromboning.
1888. H. Drummond, Tropical Africa, i. 18. The hippopotami tromboning at us within pistol-shot kept us awake.