A term of affection for a beloved person, especially one who is dear to your heart; a darling or sweetheart.
From 'heart' plus the diminutive suffix '-ling' (from Old English '-ling,' meaning young or inferior), which was very productive in creating terms of endearment in Middle English, as seen in words like 'underling' and 'duckling.'
Medieval English used '-ling' endings extensively for both cute diminutives ('duck-ling') and insulting terms ('under-ling'), showing how the same suffix could express either affection or contempt depending on tone and context.
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