Webster's Revised Unabridged Dictionary · 1913

Trill

Trill , intransitive verb

[Old English trillen to roll, turn round; of Scand. origin; compare Swedish trilla to roll, Danish trilde, Icelandic þyrla to whirl, and English thrill. Compare Thrill.]

To flow in a small stream, or in drops rapidly succeeding each other; to trickle. — Sir W. Scott
And now and then an ample tear trilled down Her delicate cheek. — Shakespeare
Whispered sounds Of waters, trilling from the riven stone. — Glover

Trill , transitive verb

[Old English trillen; compare Swedish trilla to roll.]

To turn round; to twirl. [Obsolete] — Gascoigne
Bid him descend and trill another pin. — Chaucer

Trill , transitive verb

[Italian trillare; probably of imitative origin.]

To impart the quality of a trill to; to utter as, or with, a trill; as, to trill the r; to trill a note.
The sober-suited songstress trills her lay. — Thomson

Trill , intransitive verb

To utter trills or a trill; to play or sing in tremulous vibrations of sound; to have a trembling sound; to quaver.
To judge of trilling notes and tripping feet. — Dryden

Trill , noun

[Italian trillo, from trillare. See Trill to shake.]

1.
A sound, of consonantal character, made with a rapid succession of partial or entire intermissions, by the vibration of some one part of the organs in the mouth -- tongue, uvula, epiglottis, or lip -- against another part; as, the r is a trill in most languages.
2.
The action of the organs in producing such sounds; as, to give a trill to the tongue. d
3.
(Music) A shake or quaver of the voice in singing, or of the sound of an instrument, produced by the rapid alternation of two contiguous tones of the scale; as, to give a trill on the high C. See Shake.