What does shake a leg as an idiom mean? ?

me with this

Read the excerpt from "politics and the english language" by george orwell. by this morning’s post i have received a pamphlet dealing with conditions in germany. the author tells me that he "felt impelled” to write it. i open it at random, and here is almost the first sentence that i see: "[the allies] have an opportunity not only of achieving a radical transformation of germany’s social and political structure in such a way as to avoid a nationalistic reaction in germany itself, but at the same time of laying the foundations of a cooperative and unified europe.” which statement is correct? orwell uses an example and statistical evidence in this excerpt. orwell uses an example and a quotation for evidence in this excerpt. orwell uses hypothetical and factual evidence in this excerpt. orwell uses hypothetical and statistical evidence in this excerpt.