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.
1 The barrel is the long, thin chamber that holds the insulin. 2  The barrel is marked with lines to measure the number of insulin units. 3  The plunger is a long, thin rod that fits snugly inside the barrel of the syringe.