What does this idiom mean: "Shake a leg"?

[Magomed]

Test No. incompl/inter-25 "Wrapped round her finger", question 4

Come on, shake a ......... we're running late.

(a) nose
(b) hand
(c) leg
(d) foot

Test No. incompl/inter-25 "Wrapped round her finger", answer 4

Come on, shake a leg we're running late.

Correct answer: (c) leg

Your answer was: n/a
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What does it mean? shake a leg

[Torsten]

hurry up!
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Test Of English for International Communication
TOEIC Preparation & TOEIC Vocabulary

[Sevide]

hi,
Does 'we are running late' means 'we are always become late' or sth like 'we are again late'?
thanks

[Alan]

Hi Sevide,

We are running late means we have lost some time and now we are behind in what we should be doing. You can use this for transport when a train has been delayed by a certain period of time, say 20 minutes and you would be told that the train is running 20 minutes late.

Alan
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English as a Second Language
You can read my ESL story Cool Expressions

[Sevide]

Thanks Alan
it's a great site