Origin
The saying is recorded in English from the late 14th-century, but the idea is found in the 5th-century ad in the Latin of St Augustine.
Explanation
Extensive knowledge of or close association with someone or something leads to a loss of respect for him or it. People do not respect someone they know well enough because they know his or her faults. It refers to what often happens in long-standing relationships and marriages. Regrettably, over the time too may relationships begin to see their happiness wither. Yet, the question remains: is it actually familiarity that causes this disappointment?
We might consider whether it’s familiarity that’s the culprit or whether something else is provoking contempt. At times, familiarity may in fact pave the way for greater intimacy and love. After all, when the relationship begins and we have emotional intimacy, we set the stage for falling in love. If a soft kiss, an appreciative hug or the simple feeling of being cared for becomes familiar, then familiarity in fact evokes and sustains love. In loving relationships that embrace emotional support and respect, familiarity produces a wonderful life.
Examples
The movie star doesn’t let anyone get to know him, because he knows that familiarity breeds contempt.
You two are going to find it difficult living and working together. Familiarity breeds contempt, you know.