Crossword Genius

Weaken insidiously (9)

Ross

I believe the answer is:

undermine

'weaken insidiously' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for undermine that I've seen before include "Subvert or weaken gradually" , "Burrow below" , "Weaken insidiously" , "Erode the base or foundation of" , "Sabotage; subvert" .)

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