1. to sing in a soft, gentle voice, especially in a sentimental way
2. to speak in a soft, soothing voice

Examples

• The singer crooned a romantic ballad to the audience.
• She crooned a lullaby to help the baby fall asleep.
• He crooned sweet words into her ear.
• The jazz vocalist crooned classic standards at the nightclub.
• My grandmother used to croon old folk songs while cooking.
• The mother crooned softly to comfort her crying child.