01 n. The lower ventral part of the abdomen of an animal, especially one that walks on four feet.
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1.
The lower ventral part of the abdomen of an animal, especially one that walks on four feet.
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2.
The surface of an object closest to the ground, especially of an extended object such as an airplane.
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3.
The weak point of an object vulnerable to attack; used especially in the phrase “the soft underbelly”.