twirl / twərl/ • v. [intr.] spin quickly and lightly around, esp. repeatedly: she twirled in delight to show off her new dress. ∎ [tr.] cause to rotate: she twirled her fork in the pasta. ∎ [tr.] Baseball pitch (the ball).• n. an act of spinning: Kate did a twirl in front of the mirror. ∎ a spiraling or swirling shape, esp. a flourish made with a pen.DERIVATIVES: twirl·er n.twirl·y adj.