What is to hum or sing in a low tone; to murmur softly. Here an old grandmother was crooning over a sick child, and rocking it to and fro. Dickens called?

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croon — To hum or sing in a low tone; to murmur softly. Here an old grandmother was crooning over a sick child, and rocking it to and fro. Dickens. (Webster's 1913.)

What is to hum or sing in a low tone; to murmur softly. Here an old grandmother was crooning over a sick child, and rocking it to and fro. Dickens called?

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