Bottle that's cold swigged by wife the same age as us (5,7)

I believe the answer is:

dutch courage

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'bottle' is the definition.
(thesaurus)

I don't understand the rest of the clue.

(Other definitions for dutch courage that I've seen before include "Drunken bravado" , "False bravery from drinking alcohol" , "Bottle of drink?" , "Drunken swagger" , "Bravery induced by alcohol" .)

I've seen this clue in The Telegraph.

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