Answer: warbled

AnswerCrossword Clue
WARBLEDSang like a bird
WARBLEDSang with trills.
WARBLEDTrilled
WARBLEDSang like a canary
warbledwarbled song
warbledto sing with trills, as birds
warbledWARBLE, to trill (to play with a tremulous sound)