It means literally a "cat's step".
In Ballet, it is executed by starting on two feet (foot A and foot B, for this purpose). As foot A is brought into passe the dancer jumps off of foot B and brings it quickly up into the position that would be passe if foot A were on the ground. Once the position is reached the dancers lands on foot A.
The sequence as a whole is Foot A up, Foot B up, Foot A down, Foot B down, in other words, the legs move independently of each other.
A pas de chat is always done very quickly.
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Pas de chat
The "Cat Jump" is called a "pas de chat", which means step of the cat. A pa de chat is a small jump. Pronouced pa-de-shaw
You probably mean - le pas de cheval (a horse step) see this - http://en.wikipedia.org/wiki/Glossary_of_ballet
A ballet duet is traditionally referred to as a 'pas de deux,' or dance for two. It is where a danseur and a ballerina come together and dance a series of solo and partnering variations during a classical ballet. Some famous pas de deux's are the Black Swan pas de deux in Swan Lake and the Don Quixote pas de deux.
pas de deux