Shake a leg

"Shake a leg" is an informal idiom that encourages someone to start moving or to begin an activity promptly, especially in a lively or energetic manner. Originating from the world of dance, the phrase suggests getting up and shaking one's leg to join in or participate actively. It can be used as a playful invitation or prompt to start dancing or to engage in any activity with enthusiasm and vigor.
Beyond its literal dance connotation, "shake a leg" is commonly used figuratively to urge someone to get moving or to start an activity without delay. It implies a sense of urgency or readiness to begin, often in a social or informal setting. The phrase can also convey a light-hearted and encouraging tone, encouraging someone to join in the fun or to contribute actively to a situation or event. Overall, "shake a leg" embodies the idea of initiating action with energy and enthusiasm, whether in dance or in any lively activity.