Etymology of Baaing
Combination of the words baa and ing. Baa is a word that can be traced back to 1580. Other forms include baa, baaing or bleating. Bäen is the German form, and baaing is the present participle of baa.
Baaing is used extensively in all forms of literature. Examples include Jesse Stuart’s Lambs of Heaven (“He hears the sheep bleating and the lambs baaing to their mothers.)”, Barbara Baynton’s Bush Studies (“The lamb bunted several irresponsive objects—never its dam’s udder—baaing listlessly.”) and Malcom Lowry’s poetry (“The gulls are baaing in the creek.”)—there are many, many other examples.
Durkin, Philip. The Oxford Guide to Etymology. Oxford: Oxford University Press, 2009.
Wedgwood, Hensleigh, and J. C. Atkinson. A Dictionary of English Etymology. 2d ed. London: Trübner &, 1872.