John, let's go for a dance! — Sorry, I don't know how to shakealeg.
约翰，我们跳舞去吧！——对不起，我不会跳舞。
《新英汉大辞典》
2
3：Bob! Hey, Bob, wake up! It's already 9:30 and you've got that big math test at 10 o'clock. Come on, man, shakealeg! Come on, - you've got to get moving right now!
他使劲叫醒Bob，因为已经到九点半了，而Bob十点有数学大测验。时间紧迫，所以他要Bob必须立刻行动起来。 显然他说shake a leg，是催促Bob赶快行动。这就是这个习惯用语的意思。