Noun
a note that alternates rapidly with another note a semitone above it

Verb
sing or play with trills, alternating with the half note above or below

Verb
pronounce with a trill, of the phoneme `r''; "Some speakers trill their r''s"

v. i.
To flow in a small stream, or in drops rapidly succeeding each other; to trickle.

v. t.
To turn round; to twirl.

v. t.
To impart the quality of a trill to; to utter as, or with, a trill; as, to trill the r; to trill a note.

v. i.
To utter trills or a trill; to play or sing in tremulous vibrations of sound; to have a trembling sound; to quaver.

n.
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.

n.
The action of the organs in producing such sounds; as, to give a trill to the tongue. d

n.
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.

Trill

And now and then an ample tear trilled down Her delicate cheek.

Whispered sounds Of waters, trilling from the riven stone.

Trill

Bid him descend and trill another pin.

Trill

The sober-suited songstress trills her lay.

Trill

To judge of trilling notes and tripping feet.

Trill

To flow in a small stream, or in drops rapidly succeeding each other; to trickle.

To turn round; to twirl.

To impart the quality of a trill to; to utter as, or with, a trill; as, to trill the r; to trill a note.

To utter trills or a trill; to play or sing in tremulous vibrations of sound; to have a trembling sound; to quaver.

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.