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"cuddle up" is correct and can be used in written English.
It is usually used to express feelings of tenderness and affection, especially when referring to snuggling together with another person. For example, "Let's cuddle up on the couch and watch this movie together".
Dictionary
cuddle up
verb
To lie or sit in a comfortable, relaxed position, especially holding someone else.
synonyms
Exact(59)
"It was hard to cuddle up to".
"It would be nice to cuddle up".
"You don't know which one will cuddle up to you".
Would YOU want to cuddle up in bed with him?
Nice cup of something warm and cuddle up with the computer?
At Brunel University London students and staff can cuddle up with rabbits every Friday.
I cuddle up with my son and I kiss him on the lips.
Afterwards, cuddle up in fluffy gowns (provided) by the log-burning stove.
There are worn leather chairs to fall into, overstuffed ottomans and couches to cuddle up in.
Neither seem the type to cuddle up to the new-economy virtues of the Internet.
Similar(1)
There was some close partner dancing, the cuddle-up kind; some game twirling; some shambolic samba.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com