Crossword Genius

We dined perhaps and swelled out (7)

Ross

I believe the answer is:

widened

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'swelled out' is the definition.
The definition and answer can be both related to change as well as being past participle verbs.
Maybe they are linked in a way I don't understand?

'we dined perhaps' is the wordplay.
'perhaps' is an anagram indicator.
'we'+'dined'='wedined'
'wedined' with letters rearranged gives 'WIDENED'.

'and' is the link.

Can you help me to learn more?

(Other definitions for widened that I've seen before include "Expanded" , "Made broader" , "Given more breadth" .)

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