CROON

vt to soothe by singing softly.

2. croon ·noun a low, continued moan; a murmur.

3. croon ·noun a low singing; a plain, artless melody.

4. croon ·vi to hum or sing in a low tone; to murmur softly.

5. croon ·vi to make a continuous hollow moan, as cattle do when in pain.

6. croon ·vt to sing in a low tone, as if to one's self; to hum.