cashing in your chips 

to withdraw from any enterprise or venture that appears to be on a downturn, while you yourself still can keep any personal gains.
-from the poker (or similiar betting game involving playing cards) term, where one takes their remaining chips, representing the amount of money they have left, and trades them in for their value in cash.

"at the rate your shares in the company are going, as your financial advisor, I would seriously suggest you consider cashing in your chips. Sell them off while they are still worth something!"

cashing in your chips by Bungalow Bill October 13, 2005