Definition of "vapouring"

All these valorous vapourings had a considerable effect in convincing certain profound sages, many of whom began to think the general a hero of unutterable loftiness and magnanimity of soul, particularly as he was continually protesting on the honour of a soldier—a marvellously high sounding asseveration.

1809, Diedrich Knickerbocker [pseudonym; Washington Irving], chapter IV, in A History of New York, from the Beginning of the World to the End of the Dutch Dynasty. […], volume II, New York, N.Y.: Inskeep & Bradford, […], book VI, page 110

Here, take thy satin pincushion, with thy curious half-hundred of pins in it, that you made such a vapouring about yesterday; tell them carefully, there's not one wanting.

, T. King, “Lovers Quarrels; or, Like Master Like Man: An Interlude, in One Act. Altered from ‘The Mistake’ of Sir John Vanbrugh, by T. King.”, in The Select London Stage; a Collection of the Most Reputed Tragedies, Comedies, Operas, Melo-dramas, Farces, and Interludes. […], London: G. Balne, […], act I, scene iii, page 5, column 2