trill

1. A rapid alternation between an indicated note and the one above it, in musical notation usually indicated with the letters tr written above the staff.
2. A type of consonantal sound that is produced by vibrations of the tongue against the place of articulation: for example, Spanish rr.
3. A tremulous high-pitched vocal sound produced by cats.

1. 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.
2. To impart the quality of a trill to; to utter as, or with, a trill.

   to trill a note, or the letter r

verb

To trickle.

verb

To twirl.