[It. (Florio, 1611), f. trillare, TRILL v.3] A shake or quaver = TRILL sb.2
1651. Stanley, Poems, 201. Nightingales their trillo practise here.
1656. Blount, Glossogr., Trillo, an excellent grace in singing; being an uniform trembling or shaking of the same Note.
1661. Pepys, Diary, 30 June. Myself humming to myself the trillo, and found by use that it do come upon me.
1721. DUrfey, Two Queens Brentford, IV. i. The Relish and Story int shall vie with all the Opera Trillos in Europe.
1815. Hist. J. Decastro, I. 232. A trillo from Old Comical threw her into convulsions.
b. transf. and fig.
1672. W. De Britaine, Interest Eng. in Dutch War, 25. My Genius never prompted me to the least Trillo of Grandeur.
1713. Addison, Guard., No. 124, ¶ 8. To dream On mossy pillows, by the trilloes Of a gentle purling stream.