From Longman Dictionary of Contemporary Englishthe best medicinethe best medicineFEEL HAPPY/FRIGHTENED/BORED ETCthe best way of making you feel better when you are sad Laughter is the best medicine. → medicine
Examples from the Corpus
the best medicine• A former teacher at Longlands College, Middlesbrough, Pat always believes in laughter as the best medicine for loneliness.• Having Louella come and live with me will be the best medicine in the world.• Besides, it is the best medicine.• Laughter is the best medicine.• Recovery is the best medicine for the market, but it must be sustainable. 