To make a low, murmuring or cooing sound; to croon softly or hum gently.
Variant or precursor of 'croon,' likely from Old Norse or Scandinavian roots meaning to make a low continuous sound. Related to 'growl' and 'croak' in onomatopoetic tradition.
Crool is barely used anymore, but it once described exactly what cats do when they're happy—that rumbling vibration—and animals preserve language longer than people do.
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