Definitions

1. verb

to utter a soft, low, husky, or vibrating sound, often used to mimic birdsong or other sounds; to make a soft, low, murmuring sound.

“The singer trilled a beautiful melody in her performance.”

2. noun

a soft, low, or husky sound, especially one made by a bird or other animal.

“The trillil of the nearby birds filled the morning air.”

3. interjection

an expression of pleasure, excitement, or amusement.

“The children let out a trillil of joy when they saw the birthday cake.”