What does shake a leg as an idiom mean? ?

me with this

i prefer dogs : ) they are floofyyy

it is believed to be alfred, lord himself

the statement that identifies the central idea of "the salem and other witch trail hunts" is d. while witch hunts may feel like a rare occurrence, mike kubic proves that such   incidents are not as uncommon as we originally thought.

the author is trying to show that witch hunts come in various forms and are produced by the fear of what isn't understood or it's different.