Simple past tense and past participle of croon.(verb)
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Use "crooned" in a sentence
"At his side the black runesword crooned a little, almost demanding a further letting of blood."
"While Rahman was clearly lip-synching as he 'crooned' his way to"
"While Rahman was clearly lip-synching as he 'crooned' his way to Chale Chalo, Vande Mataram and Jai Ho - thank god the crowd sang the chorus - Bips and Shahid were lacking in fizz."