I looked it up and something about the Seven Year Itch but I'm kind confused. Does it have any deep meaning in Chinese culture?
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7The etymology of this phrase is not Chinese, but comes from USA. Here's all the info you need: phrases.org.uk/meanings/seven-year-itch.html – congusbongus Aug 19 '13 at 6:52
It means seven years after marriage, both husband and wife would face numerous temptations that would harm their relationship. The seven years is a vague expression, sometimes a couple gets trouble earlier, sometimes later.
There is a movie about this. Wikipedia has some hints too. Its Baidu page tells that it's borrowed from foreign country.
Case Study
There is a perfect case: 潘粵明 與 董潔, matching the definition pretty well.
