1. (v. i.) To make a continuous hollow moan, as cattle do when in pain.

2. (v. i.) To hum or sing in a low tone; to murmur softly.

3. (v. t.) To sing in a low tone, as if to one's self; to hum.

4. (v. t.) To soothe by singing softly.

5. (n.) A low, continued moan; a murmur.

6. (n.) A low singing; a plain, artless melody.

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