i Register
In some senses, trill is marked as obsolete, slang. Watch for register when choosing this word.
noun
A rapid alternation between an indicated note and the one above it as an ornament; in musical notation usually indicated with the letters tr written above the staff.
A type of consonantal sound that is produced by vibrations of the tongue against the place of articulation: for example, Spanish ⟨rr⟩, /r/.
A tremulous high-pitched vocal sound produced by cats.
verb
To create a trill sound; 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.
To impart the quality of a trill to; to utter as, or with, a trill.
to trill a note, or the letter r
The sober-suited songstress trills her lay.
verb
To trickle.
I come now from seeing of a shepheard at Medoc[…]who had no signe at all of genitorie parts: But where they should be, are three little holes, by which his water doth continually tril from him.
And now and then an ample tear trilled down / Her delicate cheek.