croon
verb [transitive, intransitive]- croon (something)
to sing something quietly and gently 低声哼唱 She gently crooned a lullaby. 她轻声哼唱了一支摇篮曲。 Bobby Darren was crooning ‘Dream Lover’. 鲍比·达伦唱着《梦中情人》。 She crooned softly to herself. 她轻声喃喃自语。
Word Originlate 15th cent. (originally Scots and northern English): from Middle Low German and Middle Dutch krōnen ‘groan, lament’. The use of croon in standard English was probably popularized by Robert Burns.