Shake a leg and Waking up

Waking up and shake a leg are semantically related In some cases you can replace term "Waking up" with "Shake a leg", this terms are similar.

Waking up noun - The act of waking.

Shake a leg and waking up are semantically related in get out of bed topic. Sometimes you can use "Shake a leg" instead a verb "Waking up".