Crossword Genius

Look alive! Weigh cup soundly! (4,2)

Ross

I believe the answer is:

wake up

I'm a little stuck... Click here to teach me more about this clue!

'look' is the definition.
The answer and definition can be both related to bodily activities as well as being verbs in their base form.
Maybe there's a link between them I don't understand?

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for wake up that I've seen before include "one up to speed in Victoria" , "Rise and shine!" .)

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