'Only Son' in the Bible

“And I shall turn your festivals and feasts into mourningAnd all your songs into dirges (funeral poems to be sung);And I shall cause sackcloth to be put on everyone’s loinsAnd baldness on every head [shaved for mourning].And I shall make that time like a time of mourning for an only son [who has died],And the end of it shall be like a bitter day.