A leg is a weight-bearing and locomotion device. Birds and humans have two legs, but many animals have four or six or even more. A biped is an animal with two legs and quadruped is an animal with four legs. Centipedes and millipedes have many more legs.
People also use the word "leg" in idioms, for example:
- you do not have a leg to stand on (that means "you have no support; you have no chance in this discussion")
- to leg it (to run)
- to pull someone's leg (to play a little joke on someone for fun by trying to make them believe something that is not true)
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