Corporate Bonds Quotes

Question: "MAINTAIN OVERWEIGHT ON SOMETHING" what does the phrase mean?
Please help me. Here are some quotes.
- Maintain overweight on the property sector.
- I mean at the overall portfolio level we still recommend that investors maintain overweight in bonds, we’d maintain overweight on corporate credit as a good place to take risk.
http://www.cnbc.com/id/30217584/Be_on_the_Lookout_for_Narrowing_Credit_Spreads
Thanks so much!
Answer: here it explained very well:
http://en.wikipedia.org/wiki/Overweight_%28stock_market%29
Mary Buffett - Warren Buffett and Long-Term Investing