Said goodbye to a person understood to be bad (4,3)

I believe the answer is:

seen off

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'said goodbye to a person' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.

'understood to be bad' is the wordplay.
'understood' becomes 'seen' (I've seen this before).
'to be bad' becomes 'off' (I've seen this before).
'seen'+'off'='SEEN OFF'

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