Embark? Nice one! (3,2)

I believe the answer is:

get in

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'embark?' is the definition.
The answer and definition can be both to do with motion as well as being verbs in their base form.
Perhaps you can see a link between them that I don't see?

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for get in that I've seen before include "secure access" , "Effect entrance (3,.2)" , "Enter" .)

I've seen this clue in The Daily Express.

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