croon /ˈkrun/
  (vi.)(vt.)低聲歌唱,低唱,低吟低唱,低吟,輕哼
  Croon v. i.
  1. To make a continuous hollow moan, as cattle do when in pain. [Scot.]
  2. 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.
  Croon, v. t. [imp. & p. p. Crooned p. pr. & vb. n. Crooning.]
  1. To sing in a low tone, as if to one's self; to hum.
     Hearing such stanzas crooned in her praise.   --C. Bronté.
  2. To soothe by singing softly.
     The fragment of the childish hymn with which he sung and crooned himself asleep.   --Dickens.
  Croon, n.
  1. A low, continued moan; a murmur.
  2. A low singing; a plain, artless melody.
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