“Sweetheart” is kind of old-fashioned when referring two people in love, is there any replacement?
“Sweetheart” is kind of old-fashioned when referring to two people in love, is there any replacement?

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"High school sweethearts" is a set expression in contemporary English.

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Thank you, Zowee. Is there just one word with same meaning? Dictionary says lover is a relationship outside of marriage, but I am looking for a word to describe a normal girlfriend-boyfriend relationship. For example, they were high school sweethearts

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Lovers?

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You could say 'lovers' or 'in love'. Or perhaps 'they are together', or, 'they are a couple'. If you can give us a sentence it would be easier...