Crossword Genius

Fortify, buttress (10)

Ross

I believe the answer is:

strengthen

I believe this is a double definition.

'fortify' is the first definition.
(synonyms)

'buttress' is the second definition.
(thesaurus)

(Other definitions for strengthen that I've seen before include "Reinforce, substantiate" , "Bolster" , "Build up" , "Make more powerful" , "Make tough" .)

I've seen this clue in the Sydney Morning Herald.
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