Couple away begin a romantic relationship (4,3)

I believe the answer is:

pair off

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'begin a romantic relationship' is the definition.
I can't judge whether this defines the answer.

'couple away' is the wordplay.
'couple' becomes 'pair' ('pair' can be a synonym of 'couple'**).
'away' becomes 'off' ('off' can be a synonym of 'away').
'pair'+'off'='PAIR OFF'

Can you help me to learn more?

(Other definitions for pair off that I've seen before include "match" , "Form couples" , "Form a couple" .)

I've seen this clue in The Telegraph.

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