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.
A line drawn from the origin, perpendicular to the. tangent line gives the plunge amount and direction (Bengtson 1980). In a type I fold. (Fig. 5.6), the minimum plunge angle is that of the crest line and all other plunge lines. have greater plunge angles.