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Jack may get this to fold up (5)

Ross

I believe the answer is:

knife

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

This clue could be a double definition.

'jack may' is the first definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps there's an association between them I don't understand?

'this to fold up' is the second definition.
The definition suggests a singular noun which matches the answer.

'get' is the link.

Can you help me to learn more?

(Other definitions for knife that I've seen before include "Piece of cutlery" , "Attack" , "Cutting implement - stab" , "Cutting instrument" , "Cutting utensil" .)

I've seen this clue in The Globe and Mail.
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