What does this idiom mean: get cracking? Does it mean "hurry up"?

English as a Second Language English Teacher Explanations (ESL Tests)
1

Test No. [color=blue]incompl/advan-65 “What a Cracker”, question 6

For goodness’ sake hurry up because if we don’t … cracking soon we’ll miss the bus.

(a) find
(b) get
(c) use
(d) put

Test No. [color=blue]incompl/advan-65 “What a Cracker”, answer 6

For goodness’ sake hurry up because if we don’t get cracking soon we’ll miss the bus.

Correct answer: (b) get

Your answer was: [color=green]correct
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does this mean “to hurry”?

2

Yes, to get cracking means to start to be active or to hurry up.[YSaerTTEW443543]

TOEIC listening, photographs: Fishing at the ocean shore[YSaerTTEW443543]

3

Get cracking means hurry up while fire away is an invitation to start asking questions.[YSaerTTEW443543]

TOEIC listening, photographs: In the city[YSaerTTEW443543]