One of the mysteries of the English language finally explained.
1The excessive or exaggerated expression of feelings, an opinion, etc.
2Genetics. The production of abnormally large amounts of a substance which is coded for by a particular gene or group of genes; the appearance in the phenotype to an abnormally high degree of a character or effect attributed to a particular gene.
Mid 19th century; earliest use found in The Spectator. From over- + expression.
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