Crabs and their close relatives have 10 legs, arranged in five pairs. Some of their legs are used for walking, while others are used for swimming or defense.
Definition of plunge for English Language Learners. : 1  a sudden fall or jump usually from a high place. : 2  a sudden quick fall in amount, value, etc. : 3  the act of suddenly beginning to be in a particular condition or situation.
The Working Group on Financial Markets, also know as the Plunge Protection Team, was created by Ronald Reagan to prevent a repeat of the Wall Street meltdown of October 1987. Its members include the Secretary of the Treasury, the Chairman of the Federal Reserve, the Chairman of the SEC and the Chairman of the Commodity Futures Trading Commission.