An idiom is a phrase or expression that has a figurative meaning, often one that is difficult to understand from the literal definition of the words. The idiom 'A Leg Shake' is an expression used to describe someone who is eager to leave or MOVE on. It can be broken down into four words: IDIOMS (6 letters), CMON (4 letters), HIE (3 letters), and MOVE (4 letters). CMON stands for 'Come On, ' HIE is an archaic word meaning 'HASTEN, ' and MOVE is a verb meaning 'to go or change position.' Together, these words form the phrase 'A Leg Shake, ' which is used to express a desire to leave or MOVE on.