1trill 
/ˈtrɪl/ noun
plural trills /ˈtrɪl/ noun [count] 1 : the sound of going quickly back and forth many times between two musical notes that are close to each other 2 : a quick high sound that is repeated
▪ She pronounces her r's with a trill. ▪ the trill of the bird
▪ She pronounces her r's with a trill. ▪ the trill of the bird
