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Rouses and impregnates (6,2)

Ross

I believe the answer is:

knocks up

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

This clue could be a double definition.

'rouses' is the first definition.
Although both the answer and definition are verbs in their -s form, I can't see how they can define each other.

'impregnates' is the second definition.
('knock up' can be a synonym of 'impregnate')

'and' acts as a link.

Can you help me to learn more?

I've seen this clue in The Independent.
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