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The verb is borrowed from Scots croon (“to utter a deep, long-drawn-out sound; to utter a lament, mourn; to sing in a wailing voice, whimper, whine; to mutter or sing in an undertone, hum”) [and other forms], from Middle English cronen (“to sing or speak softly, hum, croon”) (croyn (Scotland)) [and other forms], probably from Middle Dutch crônen, krônen (“to groan, moan; to lament”) (modern Dutch kreunen (“to moan”)), or Old High German chrônan, krônen (“to babble, prattle; to chatter”), probably from Proto-West Germanic *kraunijan, from Proto-Indo-European *gerH- (“to cry hoarsely”). The noun is partly: * borrowed from Scots croon (“a lament, wail; mournful song; low murmuring tune; (obsolete) long-drawn-out sound”), from croon (verb): see above; and * derived from the verb. Cognates * Middle Dutch krônen (modern Dutch kreunen (“to groan, moan; to lament”)) * Middle Low German kroenen (“to babble, prattle; to chatter”), kronen (“to growl; to grumble; to scold”) * Old High German chrônan, chrônnan (“to babble, prattle; to chatter”) * Saterland Frisian krȫnen (“to cause to weep”)